ARM: at91/dt: add DMA controller node to at91sam9rl

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
ARM: at91/dt: add NAND + DMA property for at91sam9rl

Add the "atmel,nand-has-dma" property to NAND node

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>