chell: Enable software gain on internal microphone

Enable software gain because on chell there is no capture control for
internal microphone. Set maximum software gain to 2000 so Hangout can
work properly.

BUG=chrome-os-partner:50139
TEST=Use hangout. Use cras_test_client --dump_s and check Hangout
adjusts gain to around 2000 dBm.

Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org>
Change-Id: I68245195cb6802275cbc434329212d22741ddecd
Reviewed-on: https://chromium-review.googlesource.com/332919
Reviewed-by: Ben Zhang <benzh@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
1 file changed