arm64: dts: exynos: Add Ethernet node for E850-96 board

arm64: dts: exynos: Add Ethernet node for E850-96 board

The E850-96 board has a hard-wired LAN9514 chip which acts as a USB hub
and Ethernet bridge. It's being discovered dynamically when the USB bus
gets enumerated, but the corresponding Ethernet device tree node is
still needed for the bootloader to pass the MAC address through. Add
LAN9514 nodes as described in [1]. 'local-mac-address' property (in the
'ethernet' node) is used for MAC address handover from the bootloader to
Linux.

[1] Documentation/devicetree/bindings/net/microchip,lan95xx.yaml

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20250731234532.12903-1-semen.protsenko@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>