[rbp] Add support for new video codecs
Latest firmware has a start_x.elf with support for additional codecs.
These are MJPEG, VP6, VP8 and Ogg Theora. They are software GPU accelerated and should be good for SD resolutions.
This update should be harmless with firmware that doesn't support the new codecs - they will fail to open and behave as before.
Merge pull request #2119 from popcornmix/new_codecs

[rbp] Add support for new video codecs