asoc: codecs: sdm660_cdc: Fix LPASS register access during SSR

When AFE returns failure in setting the digital codec
core clock during SSR, it leads to LPASS register access
which results in NOC error and AHB timeout. Put the regmap
in cache only mode when clock enable fails to fix this.

Also fix watchdog bite failure during stability run
by returning from digclock control if cacheonly mode
is set. This is seen while SSR is in progress and teardown
of session happens, it will request for afe clock enable
continuously at digital clock control.

Change-Id: I2ba6ac4f2694c56676a1b163589c1ff711c110ec
Signed-off-by: Soumya Managoli <smanag@codeaurora.org>