dmaengine: ti: edma: Only reset region0 access registers

Region0 is used by Linux, do not reset other registers controlling access
for other shadow regions.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20190823125618.8133-3-peter.ujfalusi@ti.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>