Enable use of FFMPEG codecs for extended formats

Add OMX_AUDIO_Coding and OMX_VIDEO_Coding

Copied from the stagefright-plugins project.
OMAP4 uses it's own OMX_Audio.h, OMX_Index.h, OMX_Video.h

Conflicts:
	prebuilt/etc/media_codecs.xml

Change-Id: I2d812561124d1613e37be9457fffa2ba61605875
domx: add nBitsPerSample to FLAC

needed by updates to libstagefright

Change-Id: I4f8bb3cc1d3410472cbfa14cc4d91445b4da97f3