drm/amdgpu: add DRM MGCG header

Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/amd_shared.h

@@ -157,6 +157,7 @@ struct amd_pp_profile {
 #define AMD_CG_SUPPORT_BIF_MGCG			(1 << 19)
 #define AMD_CG_SUPPORT_GFX_3D_CGCG		(1 << 20)
 #define AMD_CG_SUPPORT_GFX_3D_CGLS		(1 << 21)
+#define AMD_CG_SUPPORT_DRM_MGCG			(1 << 22)
 
 /* PG flags */
 #define AMD_PG_SUPPORT_GFX_PG			(1 << 0)