audio_policy: Add EVRCB & EVRCWB formats for msm7x27a

Needed to compile audio hal from caf

Change-Id: Ibac3cf0b58de0bb6ee621e0498322318464492a0
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_hardware_libhardware_legacy into jb-mr1