ASoC: wcd9320: set bitwidth only on ports belonging to given DAI

Existing implementation sets all SLIMBUS RX ports to same bitwidth
setting. For concurrency use case, this logic will interfere with
configuration of all RX DAIs. Enhance the logic to only set bitwidth
for ports associated with given DAI.

Change-Id: I4284bc97858115bf3bd4baff91193b400d2a6d12
Signed-off-by: Patrick Lai <plai@codeaurora.org>