m7-common: set amplifier configs based on audio mode

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

Change-Id: Icadd71698144c120dbb26282da4e138a4d8a07d1
m7: libaudioamp: set amp mode on device change

Change-Id: I29fb5658c2e2ea6f53942d82f8e837860e3f1725
m7: libaudioamp: disable tfa9887 mode setting

Change-Id: I811e87ce37bcb75600fe4ddee70295d6e73bcd2f