drm/amd/amdgpu/vcn: Add RB decouple feature under SRIOV - P1

- Update SRIOV header with RB decouple flag
Signed-off-by: Bokun Zhang <bokun.zhang@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h

@@ -93,7 +93,8 @@ union amd_sriov_msg_feature_flags {
 		uint32_t pp_one_vf_mode    : 1;
 		uint32_t reg_indirect_acc  : 1;
 		uint32_t av1_support       : 1;
-		uint32_t reserved	   : 25;
+		uint32_t vcn_rb_decouple   : 1;
+		uint32_t reserved          : 24;
 	} flags;
 	uint32_t all;
 };