ASoC: Fix audio distortion issue during headset record

Audio is distorted during first 3 secs on headset record
while doing device switch from dmic to headset mic.
Disable BCS before slow insertion detection and enable it
afterwards to resolve the issue.

Change-Id: Ic10a499b78a00d82802e37e282441f143f9165d2
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>