ext/ffmpeg/gstffmpegcodecmap.c: Add extra detail to the Real format caps. With this info, filesrc ! ffdemux_rm ! ffde...

Original commit message from CVS:
* ext/ffmpeg/gstffmpegcodecmap.c: (gst_ffmpeg_codecid_to_caps),
(gst_ffmpeg_caps_with_codecid):
Add extra detail to the Real format caps. With this info,
filesrc ! ffdemux_rm ! ffdec_cook ! ... works, but using rmdemux
doesn't. The order of the data the demuxers output appears to be
different.