ARM: dts: aspeed: Enable networking for Asus Kommando IPMI Card

Adds the DT nodes needed for ethernet support for Asus Kommando, with
phy mode set to rgmii-id.

When this DT was originally added, the phy mode was set to rgmii (which
was incorrect). It was suggested to remove networking support from the
DT till the Aspeed networking driver was patched so that the correct phy
mode could be used.

The discussion in [1] mentions that u-boot was inserting clk delays that
weren't needed, which resulted in needing to set the phy mode in linux
to rgmii incorrectly. The solution suggested there was to patch u-boot to
no longer insert these clk delays and use rgmii-id as the phy mode for
any future DTs added to linux.

This DT was tested (on the OpenBMC u-boot fork [2]) with a u-boot DT
modified to insert clk delays of 0 (instead of patching u-boot itself).
[3] adds a u-boot DT for this device (without networking) and describes
how to patch it to add networking support. If this patched DT is used,
then networking works with rgmii-id phy mode in both u-boot and linux.

[1] https://lore.kernel.org/linux-aspeed/ef88bb50-9f2c-458d-a7e5-dc5ecb9c777a@lunn.ch/
[2] https://github.com/openbmc/u-boot/tree/v2019.04-aspeed-openbmc
[3] https://lore.kernel.org/openbmc/20260328-asus-kommando-v2-1-2a656f8cd314@gmail.com/

Signed-off-by: Anirudh Srinivasan <anirudhsriniv@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260331-asus-kommando-networking-v2-1-f7d72ae5d40d@gmail.com
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>

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