dmaengine: sprd: remove dma_slave_config direction usage

Hi Vinod,

Quoted 5 lines · Vinod Koul

dma_slave_config direction was marked as deprecated quite some time back, remove the usage from this driver so that the field can be removed

Signed-off-by Vinod Koul <[email protected]>

We already posted one patch set to fix this issue, could you have a look when you feel free? Thanks.