ASoC: wsa881x: Add support to stub out wsa functionality

Provide stub functions for wsa APIs to ads support
for build without wsa option.

CRs-fixed: 2060360
Change-Id: I349827606d20e5e62d5b84fd7be114b22d9cff2d
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>