ASoC: mbhc-adc: Fix fake electrical removal interrupts on rouleur aatc

Auto Zero mode needs to be enabled before fsm enable in sw
if hw dosen't enable auto zero mode. Do this for measure_adc_once
and cross_conn check to resolve fake electrical interrupts after
headset insertion.

Change-Id: I6915440fbccc84cab1c08710829ca5ca4276b4a5
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>