Add missing functions and signatures for older OMX video libs compat

Nvidia OMX libs need these to work
That fixes hardware OMX video codecs + Camera on TF101

Change-Id: I57fccc15968c196771546ccd1d90e21e7bba33a0
AudioTrack: Do not inline getSessionId either

Should help for other nvomx versions that requires it.

Change-Id: Ie8e3b9449ebf0915ae3432ab2f12794bb8ef39c9