arm64: dts: apple: t8103: Expose PCI node for the WiFi MAC address

Expose the PCI node corresponding to the WiFi device and give it
a 'local-mac-address' property. The bootloader will update it
(m1n1 already has the required feature).

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Hector Martin <marcan@marcan.st>