drm/amdgpu: add new CG flag for ROM clockgating

Acked-by: NTom St Denis <tom.stdenis@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -104,6 +104,7 @@ enum amd_powergating_state {
 #define AMD_CG_SUPPORT_VCE_MGCG			(1 << 14)
 #define AMD_CG_SUPPORT_HDP_LS			(1 << 15)
 #define AMD_CG_SUPPORT_HDP_MGCG			(1 << 16)
+#define AMD_CG_SUPPORT_ROM_MGCG			(1 << 17)
 
 /* PG flags */
 #define AMD_PG_SUPPORT_GFX_PG			(1 << 0)