dmaengine: pl330: do not emit loop for 1 byte transfer.

When there is only one burst required do not emit loop instructions to
loop exactly once. Emit just the body of the loop.

Signed-off-by: Michal Suchanek <hramrach@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --cc drivers/dma/pl330.c
Simple merge