ARM: davinci: Add dma_mask to dm365's eDMA device

Add dma_mask to dm365's EDMA device.

Without a valid dma_mask, EDMA on DM365 refuses to
probe.

Fixes: cef5b0da ("ARM: davinci: Add dma_mask to eDMA devices")
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Alejandro Mery <amery@hanoverdisplays.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>