mtd: rawnand: arasan: Use the right DMA mask

Xilinx ZynqMP SoC and the Arasan controller support 64-bit DMA
addressing. Define the right mask otherwise the default is 32
and some accesses may overflow the default mask.

Reported-by: Jorge Courett <jorge.courett@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Tested-by: Jorge Courett <jorge.courett@gmail.com>
Link: https://lore.kernel.org/linux-mtd/20210527084548.208429-1-miquel.raynal@bootlin.com