8960: Fix proxy channel count setup

I9660e3088bc747c30891b0aa7ec8d22096dd0fa2 changed the method, but
applied the changes only to 8974. fixit

Change-Id: I3cd36eb80732ec9f6f8274153c4ac7cd799c3aec
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_hardware_qcom_audio-caf into cm-11.0