access/v4l2: bring back deprecated pixel formats mapping.

Removed in d0494dcd.

They are equivalent to V4L2_PIX_FMT_ABGR32/V4L2_PIX_FMT_RGB32 respectively
according to [1]. They may still be used by legacy code.

[1] https://www.kernel.org/doc/html/v4.15/media/uapi/v4l/pixfmt-packed-rgb.html