FLAC coded file does not play (single metadata block files)

FLAC files which has the last metadata block flag set in
STREAMINFO were not playing. Sniff of FLAC is modified to
accomodate this set flag.

Change-Id: I76f216cc2cde6e10958324afbc704fc3e5a0e2bf
Author: Gurudatta Bhakte <gurudattax.bhakte@intel.com>
Signed-off-by: Gurudatta Bhakte <gurudattax.bhakte@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 32421
stagefright: ExtendedExtractor is for QCOM_HARDWARE

Change-Id: I81a3c3a0b6b24a3e2fd5ce2808924f3cd4dc8e24
av: Use QCOM_BSP_LEGACY ifdefs for interlace handling

 * This demolished video playback on 8974.

Change-Id: Ifca5319669c463993fca05218c06ccf49cbe6c06