ASoC: wcd9320: Configure micbias cap/capless mode

The platform data has configuration field to set micbias external
capacitor mode.
Configure micbias with this filed to get better biasing accuracy.

Change-Id: I025060a7dcfd12e8ca568adec8607eab9db7d48d
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>