hal: assign RX_CDC_DMA_RX_0 for speaker on bengal-scuba

Backend assignment for bengal-scuba is incorrect. Bengal-scuba
uses RX_CDC_DMA_RX_0 for for WSA analog mode with soundwire.

Change-Id: Id48a0106fb2f1ce317568e3a01fc870587e9fb17
1 file changed