ASoC: wcd9xxx: Switch to proper micbias source

After recording with headset is completed if headset PAs are on, micbias
source needs to be changed to vddio instead of cfilter to avoid mbhc
polling noise.  Change source of micbias avoid noise.

CRs-fixed: 484214
Change-Id: If312ecfcf87e688939b5b85dba44bc72aa06bb7e
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>