dt-bindings: dma: atmel: add microchip,sama7d65-dma

Add microchip,sama7d65-dma compatible string to DT bindings
documentation.

Signed-off-by: Ryan Wanner <Ryan.Wanner@microchip.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/8b69f0c6d8955790edcdbe5d1e205b43dedb99ff.1739555984.git.Ryan.Wanner@microchip.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>