Make sure the pool recognizes DMA_DRM caps and parses them into
GstVideoInfo that has GstVideoFormat corresponding to "drm-format"
in the caps.
Fixes
gst_video_frame_map_id: assertion 'info->finfo->format ==
meta->format' failed
Where the left side of the assertion was GST_VIDEO_FORMAT_DMA_DRM and
the right side was some GstVideoFormat converted from DRM fourcc.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8913>
e8e1430a5b