dt-bindings: rtc: at91: Add SAMA7G5 compatible strings list

Add compatible strings list for SAMA7G5.
Signed-off-by: Sergiu Moga <sergiu.moga@microchip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220304161159.147784-5-sergiu.moga@microchip.com

Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.yaml

@@ -21,6 +21,10 @@ properties:
       - items:
           - const: microchip,sam9x60-rtt
           - const: atmel,at91sam9260-rtt
+      - items:
+          - const: microchip,sama7g5-rtt
+          - const: microchip,sam9x60-rtt
+          - const: atmel,at91sam9260-rtt
 
   reg:
     maxItems: 1