gpu : introduce notion of a device

The concept of a device is being introduced for the GPU, which enables a
more efficient and scalable approach to managing multiple sensors for a
single endpoint.

Refactoring of Entity-Manager Configuration and Endpoint Discovery To
support multiple sensors for an endpoint, the following changes are
being made:

Entity-Manager Configuration Discovery: This task will be moved out of
the GPU Temperature Sensor implementation.

Endpoint Discovery: Similarly, endpoint discovery will also be performed
outside of the GPU Temperature Sensor implementation.

Frequency of Task Execution: Both entity-manager configuration discovery
and endpoint discovery will be performed only once per endpoint, rather
than repeatedly for each sensor. This optimization will improve
performance and reduce redundancy.

Tested.

```
$ curl -k -u 'root:0penBmc' https://10.137.203.137/redfish/v1/Chassis/NVIDIA_GB200_1/Sensors/temperature_NVIDIA_GB200_GPU_TEMP_0
{
  "@odata.id": "/redfish/v1/Chassis/NVIDIA_GB200_1/Sensors/temperature_NVIDIA_GB200_GPU_TEMP_0",
  "@odata.type": "#Sensor.v1_2_0.Sensor",
  "Id": "temperature_NVIDIA_GB200_GPU_TEMP_0",
  "Name": "NVIDIA GB200 GPU TEMP 0",
  "Reading": 35.96875,
  "ReadingRangeMax": 127.0,
  "ReadingRangeMin": -128.0,
  "ReadingType": "Temperature",
  "ReadingUnits": "Cel",
  "Status": {
    "Health": "OK",
    "State": "Enabled"
  }
}%
```

Change-Id: Ie3dcd43caa031b4aaa61d8be3f5d71aefd53bc9a
Signed-off-by: Harshit Aghera <haghera@nvidia.com>
diff --git a/src/gpu/meson.build b/src/gpu/meson.build
index 1ec72c4..f8cfe39 100644
--- a/src/gpu/meson.build
+++ b/src/gpu/meson.build
@@ -1,4 +1,5 @@
 gpusensor_sources = files(
+    'GpuDevice.cpp',
     'GpuMctpVdm.cpp',
     'GpuSensor.cpp',
     'GpuSensorMain.cpp',