Revert "i9500: re-enable in-call amr-wb switch"

unstable

This reverts commit bb8dbf1a869d0280294aa68fc03bf18c8ac1f74f.

Change-Id: I05a4f1f71a587dea11ba9c0b00db918741e793d8
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_device_samsung_i9500 into kk_mkt