drm/amdgpu: support runtime pm for GPUs that support BOCO

Enable runtime pm on non HG/PX BOCO capable boards.
Acked-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c

@@ -161,6 +161,9 @@ int amdgpu_driver_load_kms(struct amdgpu_device *adev, unsigned long flags)
 	}
 
 	if (amdgpu_device_supports_atpx(dev) &&
+	    (amdgpu_runtime_pm != 0)) { /* enable runpm by default for atpx */
+		adev->runpm = true;
+	} else if (amdgpu_device_supports_boco(dev) &&
 		   (amdgpu_runtime_pm != 0)) { /* enable runpm by default for boco */
 		adev->runpm = true;
 	} else if (amdgpu_device_supports_baco(dev) &&