asoc: sm6150: Add TX_CDC_DMA_TX_0 backend dailink

TX_CDC_DMA_TX_0 supports three channels, therefore it
can be used for rx_macro_echo. Add required backend dailink.
Also remove AMIC4 from ignore_suspend as it is not used for talos.

Change-Id: I74b7adca9fa4001866232c1a9173e865c2a169c4
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>