Add OperatingConfig interfaces

In order to advertise Intel Speed Select capabilities through the
Redfish OperatingConfig resources (schema 2020.2), define D-Bus
interfaces so that the Redfish server can get properties from the
application which does the Speed Select discovery.
Speed Select provides a set of processor-specific power and frequency
profiles. Currently, the only known use case of this interface is for a
Redfish client to view the profile attributes and select a profile.
Hence, the interface resembles the Redfish schema.

The intended intitial use case is that for supported CPUs,
CurrentOperatingConfig will be implemented on cpu objects (under
inventory/ tree), and child objects under each cpu will implement
OperatingConfig. For example:
 |-/xyz/openbmc_project/inventory/system/chassis/motherboard/cpu0
   |  =xyz.openbmc_project.Control.Processor.CurrentOperatingConfig
   |
   |-/xyz/openbmc_project/inventory/system/chassis/motherboard/cpu0/config0
   |  =xyz.openbmc_project.Inventory.Item.Cpu.OperatingConfig
   |
   |-/xyz/openbmc_project/inventory/system/chassis/motherboard/cpu0/config3
      =xyz.openbmc_project.Inventory.Item.Cpu.OperatingConfig

Signed-off-by: Jonathan Doman <jonathan.doman@intel.com>
Change-Id: I1663729c274aeaa5c3e78388690e9c6dd4aa3570
diff --git a/gen/xyz/openbmc_project/Inventory/Item/Cpu/OperatingConfig/meson.build b/gen/xyz/openbmc_project/Inventory/Item/Cpu/OperatingConfig/meson.build
new file mode 100644
index 0000000..1ea9320
--- /dev/null
+++ b/gen/xyz/openbmc_project/Inventory/Item/Cpu/OperatingConfig/meson.build
@@ -0,0 +1,14 @@
+# Generated file; do not modify.
+generated_sources += custom_target(
+    'xyz/openbmc_project/Inventory/Item/Cpu/OperatingConfig__cpp'.underscorify(),
+    input: [ meson.source_root() / 'xyz/openbmc_project/Inventory/Item/Cpu/OperatingConfig.interface.yaml',  ],
+    output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
+    command: [
+        sdbuspp_gen_meson_prog, '--command', 'cpp',
+        '--output', meson.current_build_dir(),
+        '--tool', sdbusplusplus_prog,
+        '--directory', meson.source_root(),
+        'xyz/openbmc_project/Inventory/Item/Cpu/OperatingConfig',
+    ],
+)
+