ASoC: wsa881x: Add loadable module support for WSA

Add support to compile WSA as a loadable module.
Move WSA kconfig tristate selection under the
machine driver loadable module kconfig.

Change-Id: If80208c85af44c06d951dbcd764d03f6511c1da8
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>
3 files changed