config: peach_pit: Change digital mic gain
config: peach_pit: Change digital mic gain

Pi has new dmic.
Change mic mic volume of codec properly with alsa control.

BUG=chrome-os-partner:24838
TEST=Measure mic volume with instrument.
Make sure mic volume is proper.

Signed-off-by: Wonjoon Lee <b961a80bc33bbc19346c547d1234eeb868c7ae74@samsung.com>
Change-Id: I2e63e866c8517de93f855d49972d7ed9b51245d4
Reviewed-on: https://chromium-review.googlesource.com/183247
Reviewed-by: Chih-Chung Chang <ebe32a3bdce230d12f75781016b6b880113fb486@chromium.org>

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