ASoC: wcd9335: Add counter to maintain count of functions voting for max bw

During voice calls slimbus underflow is observed.
This is because some functions vote without updating status mask.
Thus adding a reference counter in tasha which would keep
track of voting and unvoting instances and
unvote only when count is 0.

CRs-Fixed: 2047164
Change-Id: I50710a6dfde8bcdf750b90dc7f45e9632e8634fe
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>