dt-bindings: pinctrl: at91-pio4: add microchip,sama7g5

Add compatible string for microchip sama7g5 SoC.
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Reviewed-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200917131257.273882-1-eugen.hristev@microchip.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/atmel,at91-pio4-pinctrl.txt

@@ -4,7 +4,9 @@ The Atmel PIO4 controller is used to select the function of a pin and to
 configure it.
 
 Required properties:
-- compatible: "atmel,sama5d2-pinctrl".
+- compatible:
+	"atmel,sama5d2-pinctrl"
+	"microchip,sama7g5-pinctrl"
 - reg: base address and length of the PIO controller.
 - interrupts: interrupt outputs from the controller, one for each bank.
 - interrupt-controller: mark the device node as an interrupt controller.