arm: dts: armada-cp110-master: update nand-controller

Align node properties to kernel dts node.

The change of compatible property does not affect any currently
supported board.

Keep U-Boot specific nand-enable-arbiter, and num-cs for compatibility
with the current driver.

Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>