Backport of "gstwlvideoformat: may be wrong mapping between DRM and GST format about RGB" into 1.22
Backport of !5620 (merged) "gstwlvideoformat: may be wrong mapping between DRM and GST format about RGB".
Commits:
- 050e7f48 waylandsink: fix incorrect RGB and BGR mapping about GST DRM and WL_SHM