arm/dt: msm8226: Fix micbias settings for audio

Microphone bias is used by headset detection to perform plug type
determination. External capacitor presence on micbias path is per
board type. Fix the bypass capacitor setting for micbias to fix
headset detection.

Change-Id: Ied59b87373a1418b1462c0bcdb033ec1ec43c5d9
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>