asoc: wsa883x: Update OTP_REG_0 as volatile reg

For WSA variant info is available in this register
OTP_REG_0. Make it volatile read-only register
to always read from hardware.

Change-Id: I1c543875748d08304b4abe6c73594bc116d08c6d
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>