ASoC: wsa881x: update register defaults in cache

WSA881x version based register default values are
updated using regmap_register_patch() API, which
will bypass the cache. Fix this by enabling cache_only
flag before updating the register reset values.

Change-Id: I5c6838d9c84f9e0233c22f638238afc5d4a8980d
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>