hal: Fix ANC headset for use with independent backend

ANC headset device requires support for independent backend
(SLIM_6_RX) same as headphone. Headphones use case controls
are reused when anc-headphone is selected.

CRs-Fixed: 992816
Change-Id: Ibd342995f271728dd7f8e3dd8c03bbc4a48e1a39