vl: add cap for stacking frames

Signed-off-by: Leo Liu <leo.liu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>

src/gallium/include/pipe/p_video_enums.h

@@ -68,7 +68,8 @@ enum pipe_video_cap
    PIPE_VIDEO_CAP_PREFERS_INTERLACED = 5,
    PIPE_VIDEO_CAP_SUPPORTS_PROGRESSIVE = 6,
    PIPE_VIDEO_CAP_SUPPORTS_INTERLACED = 7,
-   PIPE_VIDEO_CAP_MAX_LEVEL = 8
+   PIPE_VIDEO_CAP_MAX_LEVEL = 8,
+   PIPE_VIDEO_CAP_STACKED_FRAMES = 9
 };
 
 enum pipe_video_entrypoint