m7-common: update wifi config

* Update from hammerhead

Change-Id: I1095f6c4b38db887f095a4321c93cb464222b674
m7-common: clean up init script

Change-Id: Ia622eb4a9867bf67c96b4cef1468d058562aeeba
m7-common: Fix remote submix

* Declare remote submix as a valid input

Change-Id: Ifb55029fd37eaf8b9e92ae5fb07320d462008f2f
m7-common: enable telephony latency optimization

Change-Id: I31a6ff2935517a4f60d43e04cf9de62ecbfc76f9
m7-common: clean up overlay

* No real changes, just re-orders overlay items according to their
  ordering in frameworks/base.
* Satisfies my OCD.

Change-Id: Ie83ec98402bfe03e0ae3e2ad87fb65b20f41d581