msm8660-common: Fix VoIP on Samsung devices

* Remove the QCOM_VOIP_ENABLED because it requires MVS which does not work
* Added USE_SAMSUNG_VOIP_DEVICE to use Samsung audio voip devices
* Add audio_policy.conf to common
* Add back mic to the audio policy config

Change-Id: I8900f6aa5af0042b3a4f77258a088fea9a903742