omx: Add nBitsPerSample parameter for FLAC

 * Necessary to convey this information from the extractor.

Change-Id: Ic6f689df9d5f840280bf0410021f6d6ee04a48d5
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_frameworks_native into android-4.4_new