Revert "legacy/msm7x30: Use audio policy from legacy/alsa_sound"

This broke build... which I'll fix. Beyond that, I could give a fuck less if sound works on these devices.

Eslam? Arnav?

This reverts commit d13dc494f88a403d58c7777a6e6f5b104de99e1a.

Change-Id: I3fa184683ec88d667b0318be565771cce0b55869