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>