av: QC AAC encoder supports 320KBps

Change-Id: Ic937a79cd081aa1ccde395d29c02111019454003
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_frameworks_av into cm-11.0
Merge branch 'cm-11.0' of https://github.com/temasek/android_frameworks_av into HEAD