ASoC: wcd9310: Route MBHC override to micbias 2 during calibration

wcd9310's MUX for calibration is connected only to micbias 2.
Therefore if MBHC micbias is other than micbias 2, it's required to route
override to micbias 2 during calibration.
Set cfilt which is associated with micbias 2 as fast mode during
calibration for the same reason.

CRs-fixed: 369684
Change-Id: I910a8d6747ad013fbd7a006662a650f048ffc545
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>