audio: Unhide PCM offload enums

Change-Id: Iab074ae64d293781769032cc902e72a93374679f
tegra3-common: Fix vp9 video playback

Playing embedded Youtube videos in a browser (Chrome & stock) previously
failed with the following error message.

I/OMXClient( 3036): Using client-side OMX mux.
E/ACodec  ( 3036): Unable to instantiate a decoder for type 'video/x-vnd.on2.vp9'.
E/MediaCodec( 3036): Codec reported an error. (omx error 0x80001003, internalError -2147483648)
E/MediaCodecBridge( 3036): Failed to create MediaCodec: video/x-vnd.on2.vp9, isSecure: false, direction: 0
E/MediaCodecBridge( 3036): java.io.IOException: Failed to allocate component instance
E/MediaCodecBridge( 3036): 	at android.media.MediaCodec.native_setup(Native Method)
E/MediaCodecBridge( 3036): 	at android.media.MediaCodec.<init>(MediaCodec.java:210)
E/MediaCodecBridge( 3036): 	at android.media.MediaCodec.createDecoderByType(MediaCodec.java:186)
E/MediaCodecBridge( 3036): 	at com.android.org.chromium.media.MediaCodecBridge.create(MediaCodecBridge.java:219)
E/MediaCodecBridge( 3036): 	at com.android.org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)
E/MediaCodecBridge( 3036): 	at com.android.org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:24)
E/MediaCodecBridge( 3036): 	at android.os.Handler.dispatchMessage(Handler.java:102)
E/MediaCodecBridge( 3036): 	at android.os.Looper.loop(Looper.java:136)
E/MediaCodecBridge( 3036): 	at android.app.ActivityThread.main(ActivityThread.java:5146)
E/MediaCodecBridge( 3036): 	at java.lang.reflect.Method.invokeNative(Native Method)
E/MediaCodecBridge( 3036): 	at java.lang.reflect.Method.invoke(Method.java:515)
E/MediaCodecBridge( 3036): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
E/MediaCodecBridge( 3036): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
E/MediaCodecBridge( 3036): 	at dalvik.system.NativeStart.main(Native Method)
E/chromium( 3036): [ERROR:video_decoder_job.cc(38)] Failed to create VideoDecoderJob.

Change-Id: Ia4e2548a97c95740fd35deb144f184eac32a9da8
tegra3-common: Add vp8 encoder and gsm decoder from grouper media_codecs.xml

Change-Id: Iba5d6287996488aa7e252d9a6de68f9859cbd62b