Revert "omx: Add nBitsPerSample parameter for FLAC"

This reverts commit 5fa201c9919d22b3470ae64e4952df2221ba5b16.

Change-Id: I800c9c057de4d42d19bf95ff07fa382616dfff6d
Merge remote-tracking branch 'cyan/cm-12.0' into cm-12.0