tegra3-common: Update media_codecs, media_profiles and audio_policy

* Include google codecs
* Use codec attributes from grouper hoping that they're correct
* Remove camera 2 and 3 from media_profiles
  Our device only has two cameras
* Add r_submix and usb audio modules to audio_policy
  Possible future Chromecast and USB audio support

Change-Id: I247784a5e0834019d0f89aeb0db2bd156aba42e1