Revert "audio/msm7x30: Use kernel headers for 7x30."

This reverts commit b3c201a4832a29a9a6e57a100a93f0ade027ff1e.
Revert "audio/msm7x30: #ifdef HTC audio changes"

This reverts commit 14030ec61e9980e7f297a701a2c8cc9a0ac385cc.