ASoC: msm: qdsp6v2: add routing for voice2 on secondary aux pcm

Add routing control to route Voice2 on Secondary Aux PCM interface.
This change is needed for msm8994 target.

Change-Id: Ic73fc16ab285b3eaae26e24e0a3a040432b89e90
Signed-off-by: Narsinga Rao Chella <nrchella@codeaurora.org>