ASoC: wcd9xxx: don't wait for mic volage to settle

When electrical mbhc runs removal irq shouldn't run mic voltage settle
logic as it can mean actual headset removal.
Fix to report plug type removal immediately to avoid delay.

CRs-fixed: 482885
Change-Id: I01779cb9b8031613c8b9f2377ff723101700c6b9
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>