omx: Add nBitsPerSample parameter for FLAC

 * Necessary to convey this information from the extractor.

Change-Id: Ic6f689df9d5f840280bf0410021f6d6ee04a48d5
Merge remote-tracking branch 'cm/cm-11.0' into kitkat
Merge remote-tracking branch 'aospa-legacy/kitkat' into kitkat-legacy