FLAC: add flac decoder in omx and support flac in Matroska extractor

Test: play test file in the bug
Bug: 37787245
Bug: 37794552
Change-Id: I16c760cb818e532ac7cb701f96c635ca122cb8c9
(cherry picked from commit 47edb3ac9ef15284a87b0ebd939c1aa9dc9c6858)
17 files changed