Fix build error caused by frameworks/av changes.

This adds nBitsPerSample to OMX_AUDIO_PARAM_FLACTYPE
This change is copied from:
frameworks/native/include/media/openmax/OMX_Audio.h

Change-Id: I6b700416b346d26a02c43158798c21cc2ce34511
Automatic translation import

Change-Id: If711f0afd594130086e0ec4ceb6d4aad19188ae0