Move NAND specific device tree parsing to NAND driver.

The NAND controller node must have a compatible id, register space
resource and interrupt resource.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Acked-by: NBrian Norris <computersforpeace@gmail.com>
Acked-by: NTony Lindgren <tony@atomide.com>