dt-bindings: dmaengine: at_xdmac: add compatible with microchip,sama7g5

Add compatible to sama7g5 SoC.
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201016081754.288488-1-eugen.hristev@microchip.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/dma/atmel-xdma.txt

@@ -2,7 +2,8 @@
 
 * XDMA Controller
 Required properties:
-- compatible: Should be "atmel,sama5d4-dma" or "microchip,sam9x60-dma".
+- compatible: Should be "atmel,sama5d4-dma", "microchip,sam9x60-dma" or
+  "microchip,sama7g5-dma".
 - reg: Should contain DMA registers location and length.
 - interrupts: Should contain DMA interrupt.
 - #dma-cells: Must be <1>, used to represent the number of integer cells in