surfaceflinger: Add ifdefs for secure display query

 * The HWC_SECURE feature is only implemented for devices using
   QC-CAF hwcomposers.

Change-Id: I1aa72864ba6a0e62fd7cee74631b57200db3db4f
Revert "omx: Add nBitsPerSample parameter for FLAC"

This reverts commit 5fa201c9919d22b3470ae64e4952df2221ba5b16.

Change-Id: I800c9c057de4d42d19bf95ff07fa382616dfff6d