Missing support for Motion jpeg (as mjpeg or .avi) in case of s922x and maybe others amlogic processors

Please add mjpeg to only software decoding (disable am-amjpeg), also for situation generaly enabled hw decoding of all formats. Only as ffmpeg software decoding for mjpeg would be good solution for it in CE21NG and CE22NO. If is not device with good hw acceleration of mjpeg on CE21NG and CE22NO. Thank you.