v4l2codecs: Update videodev2.h with V4L2_FMTDESC_FLAG_ENUM_ALL flag
Add V4L2_FMTDESC_FLAG_ENUM_ALL flag to support discovering all possible pixel formats. Add V4L2_FMT_FLAG_META_LINE_BASED to not create a hole in flag definition.
Forked from !7078 (closed) to workaround CI bugs.