drm/amdgpu:Add DPG support flag

Add DPG support flag for VCN DPG mode.
Signed-off-by: NJames Zhu <James.Zhu@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NHuang Rui <ray.huang@amd.com>
Acked-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -109,6 +109,7 @@ enum amd_powergating_state {
 #define AMD_PG_SUPPORT_GFX_PIPELINE		(1 << 12)
 #define AMD_PG_SUPPORT_MMHUB			(1 << 13)
 #define AMD_PG_SUPPORT_VCN			(1 << 14)
+#define AMD_PG_SUPPORT_VCN_DPG	(1 << 15)
 
 enum PP_FEATURE_MASK {
 	PP_SCLK_DPM_MASK = 0x1,