msm7x30: Initial audio_policy.conf update

Cloned from:
https://github.com/LegacyXperia/android_device_semc_msm7x30-common/commi
t/75ef6080cc7b342efec462016370a30ddf3e4bd8#diff-3cdf1d7fa1588283a22e7b36
773e44abR59