overlay: 8994: De-prioritize DMA pipe in line mode

De-prioritize DMA pipes in line mode on 8994. If DMA pipes need to be
used in block mode for downscale, there could be cases where
consecutive rounds need separate modes, which cannot be supported
since we at least need 1 round in between where the DMA is unused

Change-Id: I9cdcb5c699ddb34b6730ff32ff5e17c457c0fa12
2 files changed