stagefright: Fix FFMPEG catchall decoders

 * Get this metadata properly flowing
 * Allows us to play tracks such as Apple Lossless :)

Change-Id: I2990b30eef5b672da339d24444424c61a43b85c2
Merge branch 'cm-12.0' of git://github.com/CyanogenMod/android_frameworks_av into cm-12.0