alsa_source: Undo the proxy/latency changes

 * This change causes problems on 4.3, revert it all.

Change-Id: I1d703e379fa9949fb4d8d51c59515acf68a97793

Conflicts:
	alsa_sound/AudioHardwareALSA.h
audio-caf: snd_use_case_apply_voice_acdb: initialise current_mod[]

Change-Id: I38fd1638e34f38e97e9e48a0ddf51bb31e3b10f8
alsa_sound: Fix camcorder input selection

Change I1ddc6460a91752fd7673d84fd41b70365d83d90c was supposed to
address camcorder during calls, and ended up forcing the main mic
for every other use case. Don't do that.

Change-Id: I4ecc11de57603ec12d2f60e408469f90ef3696b9