Instead of duplicating the GStreamer format to DRM fourcc mapping, this patch uses the GstVideo library helpers. This duplicates the big O of looking for, since the two lists are traversed, but it's less error prone. Partially reverts commit 547f3e8622a39ce971c272f2c31eab8f1fdfbb45. Fixes: #3354 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6731>