asoc: Fixed wsa881x codec machine driver callback

Removed unused callback method for wsa881x analog codec
from machine driver. Also update digital codec driver name
to register the codec component successfully.

Change-Id: I1c2ada4b184ee582e657748bf883b59798dd7d34
Signed-off-by: Subhadra Jagadeesan <subhja@codeaurora.org>