Fix wifi startup timing issue

Bug: 17358965
Change-Id: Iacafcf1a1a9fed9755912b591eacdefd6992b088
remove /dev/diag node

Bug: 18203257
Change-Id: I7b9a2bdf0df6511317d59aa13fc187ab38795481
Move wifi setup script from main to late_start

Bug: 17358965
Change-Id: Ia4d2d99228cdf4a253c6ce06db7b621c618634cb
mako: add DSP manager bits to audio_conf

and get rid of the generic one in vendor_slim
legacy already use there own
Change-Id: Ic1e3d8578121f9e04439e1d55d5da9494c5045ea
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