ASoC: wcd-mbhc: Add support moisture detection in headset jack

WCD9335 version 2.0 mbhc will support detection of moisture
in headset jack. Add support to configure the mbhc moisture
detection parameters - pull up current source, comparator
Vref threshold - to enable detecting moisture in headset
jack. This will prevent fake mechanical insertion which
can possibly be triggered whenever moisture is present in
the headset jack.

Change-Id: I3e026e288788700ea2328ccbd12f79f5c40642ac
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>