Support for RTL838x based managed switches

[goetz]

@svanheule

Only if there are hardware differences. If the device is fully supported with the current image, then I don't see the need to add what is essentially an alias. If you insisted, the DTS could be updated to explicitly reflect v1+v2 support, with associated DEVICE_ALTx_* variables in the Makefile.

Thank you for the explanation.

Submitted PR #14967 for review.
Thank you for any feedback on this.