ARM: dts: microchip: sam9x60ek: Add IRQ support for ethernet PHY

Add interrupt support for ethernet phy subnode.
Add PB8 definition to macb0 pinctrl.
Signed-off-by: Mihai Sain <mihai.sain@microchip.com>
Link: https://lore.kernel.org/r/20231109131149.46397-3-mihai.sain@microchip.com
[claudiu.beznea: s/at91/microchip in commit title to match dts directory]
Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>

arch/arm/boot/dts/microchip/at91-sam9x60ek.dts

@@ -292,6 +292,8 @@ &macb0 {
 
 	ethernet-phy@0 {
 		reg = <0x0>;
+		interrupt-parent = <&pioB>;
+		interrupts = <8 IRQ_TYPE_LEVEL_LOW>;
 	};
 };
 
@@ -465,6 +467,7 @@ AT91_PIOB 4 AT91_PERIPH_A AT91_PINCTRL_NONE	/* PB4 periph A */
 				 AT91_PIOB 5 AT91_PERIPH_A AT91_PINCTRL_NONE	/* PB5 periph A */
 				 AT91_PIOB 6 AT91_PERIPH_A AT91_PINCTRL_NONE	/* PB6 periph A */
 				 AT91_PIOB 7 AT91_PERIPH_A AT91_PINCTRL_NONE	/* PB7 periph A */
+				 AT91_PIOB 8 AT91_PERIPH_GPIO AT91_PINCTRL_NONE	/* PB8 IRQ GPIO */
 				 AT91_PIOB 9 AT91_PERIPH_A AT91_PINCTRL_NONE	/* PB9 periph A */
 				 AT91_PIOB 10 AT91_PERIPH_A AT91_PINCTRL_NONE>;	/* PB10 periph A */
 		};