dmaengine: at_xdmac: convert callback to helper function
This is in preperation of moving to a callback that provides results to the callback for the transaction. The conversion will maintain current behavior and the driver must convert to new callback mechanism at a later time in order to receive results. Signed-off-by: NDave Jiang <dave.jiang@intel.com> Reviewed-by: NLars-Peter Clausen <lars@metafoo.de> Cc: Ludovic Desroches <ludovic.desroches@atmel.com> Signed-off-by: NVinod Koul <vinod.koul@intel.com>
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