asoc: lahaina: add flag to indicate if wcd is disabled

On some lahaina devices, wcd codec is disabled and it would cause
issue when trying to use wcd widgets. Add flag to indicate if wcd
is disabled

Change-Id: Id19d0bd83728b10b457767f7d43cba8dac916772
Signed-off-by: Meng Wang <mengw@codeaurora.org>