drm/amdgpu: add uapi to define van gogh series

Add a flag to define van gogh series.
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>

include/uapi/drm/amdgpu_drm.h

@@ -1083,6 +1083,7 @@ struct drm_amdgpu_info_vce_clock_table {
 #define AMDGPU_FAMILY_AI			141 /* Vega10 */
 #define AMDGPU_FAMILY_RV			142 /* Raven */
 #define AMDGPU_FAMILY_NV			143 /* Navi10 */
+#define AMDGPU_FAMILY_VGH			144 /* Van Gogh */
 
 #if defined(__cplusplus)
 }