The descriptors are allocated via wither dma_pool or dma_alloc_coherent.

There is no need for the dma_sync_singel_* calls.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Link: https://lore.kernel.org/r/20200707102352.28773-2-peter.ujfalusi@ti.comSigned-off-by: Vinod Koul <vkoul@kernel.org>