ASoC: wcd934x: Change the default value of moisture detection register

The moisture detection is enabled by default. Change the default value
of the register to disable moisture detection during codec out of rest.
The moisture detection can be enabled during MBHC initialization by
setting flag "moisture_en" to "true" in machine driver to update this
register.

Change-Id: Ib6d378b5b00572016f8ee1c0885073fd0673c625
Signed-off-by: Xiaoyu Ye <benyxy@codeaurora.org>