ASoC: codecs: wsa881x: add codec dai for each wsa881x

Add new codec dai for each wsa881x, since each WSA is
initialized as a codec and not as aux device.

Change-Id: Ifee063cea54a65600d9040390666d58de49a0689
Signed-off-by: Shuai Zhang <quic_shuzhan@quicinc.com>