msm8960: remove deprecated audio_policy.msm8960

Change-Id: I26daa49d597d9f6385152860c54e389a942541b8
Revert "msm8960-common: Disable broken QCOM audio features"

This reverts commit 04a783a82fe49f1ba169557e5cb8001f192c6240.

Change-Id: I461343e8cf6b4ed0a0ffce1d754ede5688be2c20