Revert "Disable lpa.decode to fix headset playback on msm8960"

This reverts commit e3e9a1d527b312edb9393a7fd026c1c588428cb3.

Reason : https://github.com/CyanogenMod/android_device_motorola_qcom-common/commit/2c5b6453fd3eab6210a0c937428682ff96383a5e

Change-Id: Ic4e4e99539322a0b14fb9ed9ed9d2fa9d4f76ccc