dt-bindings: dmaengine: at_xdmac: add compatible with microchip,sam9x7

Add compatible for sam9x7.

Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230728102451.265869-1-varshini.rajendran@microchip.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: varshini-rajendran

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

@@ -3,7 +3,8 @@
 * XDMA Controller
 Required properties:
 - compatible: Should be "atmel,sama5d4-dma", "microchip,sam9x60-dma" or
-  "microchip,sama7g5-dma".
+  "microchip,sama7g5-dma" or
+  "microchip,sam9x7-dma", "atmel,sama5d4-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