dt-bindings: iio: adc: at91-sama5d2: add compatible for sama7g5-adc

Add compatible for microchip,sama7g5-adc device.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Link: https://lore.kernel.org/r/20210901123013.329792-2-eugen.hristev@microchip.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/adc/atmel,sama5d2-adc.yaml

@@ -15,6 +15,7 @@ properties:
     enum:
       - atmel,sama5d2-adc
       - microchip,sam9x60-adc
+      - microchip,sama7g5-adc
 
   reg:
     maxItems: 1