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Connect4: Swap LED mode of SoC Ethernet

Ghost User requested to merge devel/revpi-3119/connect4-led-mode into revpi-5.10

Created by: l1k

Existing RevPi products use a green LED to signify link presence and an amber LED to signify activity.

The Connect 4's LAN7800 Ethernet retains that color scheme, but the SoC Ethernet does not: It uses green for activity and amber for link.

Invert the color scheme of the SoC Ethernet for consistency.

An effort is ongoing in mainline to introduce a standardized API and DeviceTree schema for Ethernet LED modes. It's still in review though, so use the Foundation's custom DeviceTree property for now:

https://lore.kernel.org/all/20230427001541.18704-1-ansuelsmth@gmail.com/

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