wcd9xxx-slimslave: Disable slim TX underflow auto recovery

Disable slim TX port underflow auto recovery mechanism
to avoid TX mute issues during speaker and headphone
device switch during voice call.

CRs-Fixed: 2000190
Change-Id: I2717369626c3ff27f66ec1d0a81e31af33998b8a
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>