hal: avoid setting stereo channel mask to voip usecase

Voip usecase is started with stereo channel mask. This is
not allowed due to voip_rx profile is not supported.

Fix it by setting channel mask to mono for voip usecase.

CRs-Fixed: 2418048
Change-Id: I949808076a56cf2e43f0309ce1656646e0495087
1 file changed