ASoC: Avoid reg updates when WSA is not in active state

WSA state is set to active during codec startup
and state is reset during codec shutdown.
Read or write to wsa codec registers only when state
is active.

Change-Id: I6c3e85528b7117643bfba2cca36ebff39d05a607
Signed-off-by: Soumya Managoli <smanag@codeaurora.org>