audio test
mako: enable echo cancellation for voice communication

This greatly improves the quality of VoIP calls, tested on the app
"LINE". Without this, the other party will be able to hear echo
of their own voice.

Reference: http://source.android.com/devices/audio_implement.html#preprocessing

Change-Id: Id0ccb732778ecc8d4c9e140249ec230654f351cc
fix path to mpd and add path in mixer_paths
g2: cleanup and quiet logspam

Conflicts:
	g2.mk
g2: edit some build.props

fix speaker mode when calling
less gpu rendering
g2: disable nfc debugging
g2: add missing pre-processing path to audio_effects
hammerhead: configure load dependent update rates

Change-Id: Ic4237b5f025234e4ce5574ee4e5d94df3ac20b7e
Signed-off-by: Dan Trifan <jimsth@gmail.com>

Conflicts:
	rootdir/init.g2.rc
Cleanup and and some missing overlays
camera: Restart preview after ZSL changes only if the preview is running

Don't touch the preview state if it was stopped to begin with

Change-Id: Ie81c01165778f98f92f11badc17c2023ea4610b7
Merge branch 'audiotest' into kk-clean