drm/amdgpu: add GFX Power Gating support for yellow carp

Add GFX Power Gating support.
Signed-off-by: Aaron Liu <aaron.liu@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1336,7 +1336,7 @@ static int nv_common_early_init(void *handle)
 			AMD_CG_SUPPORT_GFX_FGCG |
 			AMD_CG_SUPPORT_MC_MGCG |
 			AMD_CG_SUPPORT_MC_LS;
-		adev->pg_flags = 0;
+		adev->pg_flags = AMD_PG_SUPPORT_GFX_PG;
 		adev->external_rev_id = adev->rev_id + 0x01;
 		break;
 	default: