dmaengine: enable mxs-dma for imx6ul
The mxs-dma unit is also available on i.MX6UL. Make it possible to
select it in Kconfig.
Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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