SWDEV-301947 - Add new query for physical CU count

Add hipDeviceAttributePhysicalMultiprocessorCount to get all
available CUs for a device.

Change-Id: Ie6a2c6e958df9627f39c91d0651b89ef5bffd8fe

hipamd/src/hip_device_runtime.cpp

@@ -319,6 +319,9 @@ hipError_t hipDeviceGetAttribute(int* pi, hipDeviceAttribute_t attr, int device)
   case hipDeviceAttributeImageSupport:
     *pi = static_cast<int>(g_devices[device]->devices()[0]->info().imageSupport_);
     break;
+  case hipDeviceAttributePhysicalMultiProcessorCount:
+    *pi = g_devices[device]->devices()[0]->info().maxPhysicalComputeUnits_;
+    break;
   default:
     HIP_RETURN(hipErrorInvalidValue);
   }