asoc: codecs: sdm660_cdc: Return from digclock control if cacheonly

While SSR in progress, and teardown of session happens
it will request for afe clock enable continuously at
digclock control. Return from digclock control
if cache only mode is set which avoids continuous
afe failures and watchdog bite failure at stability runs.

Change-Id: I9a2349c1e937fc7606c760afa17b1eb0d4833126
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>