arm/dt: 8974-liquid: fix digital microphones biases

On the liquid platform, digital microphones are powered
with different micbias different than other platforms.
Rearrange audio routing map accordingly for Liquid platform.

Change-Id: I08f1ad1ffb2a4909b430d912f654b306a4a708b6
Signed-off-by: Tanya Finkel <tfinkel@codeaurora.org>