nvidia-gpu: add Power Sensor PeakReading Property

Add support for Sensor Properties PeakReading and PeakRedingTime.

Current Limitation -
The ResetMetrics action is currently not supported for Redfish URIs in
bmcweb. As a result, the ability to clear PeakReading values for GPU
Power Sensors has not been implemented.

Future Consideration -
If ResetMetrics action support is added to bmcweb in the future, the
corresponding functionality will also need to be implemented in the
dbus-sensor application to ensure full compatibility.

Tested: Build an image for gb200nvl-obmc machine with the following
patches cherry picked. This patches are needed to enable the mctp stack.

https://gerrit.openbmc.org/c/openbmc/openbmc/+/79422

```
root@gb200nvl-obmc:~# busctl introspect xyz.openbmc_project.GpuSensor /xyz/openbmc_project/sensors/power/NVIDIA_GB200_GPU_0_Power_0
NAME                                                  TYPE      SIGNATURE  RESULT/VALUE                             FLAGS
org.freedesktop.DBus.Introspectable                   interface -          -                                        -
.Introspect                                           method    -          s                                        -
org.freedesktop.DBus.Peer                             interface -          -                                        -
.GetMachineId                                         method    -          s                                        -
.Ping                                                 method    -          -                                        -
org.freedesktop.DBus.Properties                       interface -          -                                        -
.Get                                                  method    ss         v                                        -
.GetAll                                               method    s          a{sv}                                    -
.Set                                                  method    ssv        -                                        -
.PropertiesChanged                                    signal    sa{sv}as   -                                        -
xyz.openbmc_project.Association.Definitions           interface -          -                                        -
.Associations                                         property  a(sss)     1 "chassis" "all_sensors" "/xyz/openb... emits-change
xyz.openbmc_project.Sensor.Value                      interface -          -                                        -
.MaxValue                                             property  d          5000                                     emits-change
.MinValue                                             property  d          0                                        emits-change
.Unit                                                 property  s          "xyz.openbmc_project.Sensor.Value.Uni... emits-change
.Value                                                property  d          29.194                                   emits-change writable
xyz.openbmc_project.Sensor.ValueMutability            interface -          -                                        -
.Mutable                                              property  b          true                                     emits-change
xyz.openbmc_project.State.Decorator.Availability      interface -          -                                        -
.Available                                            property  b          true                                     emits-change writable
xyz.openbmc_project.State.Decorator.OperationalStatus interface -          -                                        -
.Functional                                           property  b          true                                     emits-change
xyz.openbmc_project.Telemetry.Report                  interface -          -                                        -
.Readings                                             property  (ta(ssdt)) 0 1 "PeakReading" "" 80.933 0            emits-change
```

Change-Id: I0a4f7eb0a5db688f32bf80954839140da9bb7e2a
Signed-off-by: Harshit Aghera <haghera@nvidia.com>
diff --git a/src/nvidia-gpu/NvidiaGpuDevice.cpp b/src/nvidia-gpu/NvidiaGpuDevice.cpp
index a13bcfe..9560220 100644
--- a/src/nvidia-gpu/NvidiaGpuDevice.cpp
+++ b/src/nvidia-gpu/NvidiaGpuDevice.cpp
@@ -17,6 +17,7 @@
 #include <MctpRequester.hpp>
 #include <NvidiaGpuEnergySensor.hpp>
 #include <NvidiaGpuMctpVdm.hpp>
+#include <NvidiaGpuPowerPeakReading.hpp>
 #include <NvidiaGpuPowerSensor.hpp>
 #include <NvidiaGpuThresholds.hpp>
 #include <NvidiaGpuVoltageSensor.hpp>
@@ -74,6 +75,10 @@
         conn, mctpRequester, name + "_Power_0", path, eid, gpuPowerSensorId,
         objectServer, std::vector<thresholds::Threshold>{});
 
+    peakPower = std::make_shared<NvidiaGpuPowerPeakReading>(
+        mctpRequester, name + "_Power_0", eid, gpuPeakPowerSensorId,
+        objectServer);
+
     energySensor = std::make_shared<NvidiaGpuEnergySensor>(
         conn, mctpRequester, name + "_Energy_0", path, eid, gpuEnergySensorId,
         objectServer, std::vector<thresholds::Threshold>{});
@@ -120,6 +125,7 @@
     }
     dramTempSensor->update();
     powerSensor->update();
+    peakPower->update();
     energySensor->update();
     voltageSensor->update();