dts: arm: atmel: samx7x: synchronize SAM E70/V71 DMA PERIDs

Synchronize the Atmel SAM E70/V71 DMA Peripheral Hardware Requests HW
Interface Numbers and adjust them to match those listed in the SAM
E70/S70/V70/V71 datasheet.

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>