m7-common: remove extraneous proprietary files

Change-Id: I78bd71f3ffa446a0736995f5acac0f91202691d1
m7-common: set amplifier configs based on audio mode

Depends on: http://review.cyanogenmod.org/#/c/38256/

Change-Id: Icadd71698144c120dbb26282da4e138a4d8a07d1