soc: swr-wcd: Apply div2 setting on slave side before bank switch

In soundwire controller, bank switch happen twice
for a playback session with stereo speakers. Ensure
the setting of div2 applied to inactive bank before
bank switch occurs to avoid impact based on bank chosen.

Change-Id: I033b19e78309485ca9da85ec67b54409e6fe22cc
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>