VisionFive 2 ethernet support added

[Nick Hudson <nick.hudson%gmx.co.uk@localhost>]

Hi,

I've just committed ethernet support for the VF2 board which makes it
the most useful risc-v hardware I have.

Full dmesg is here:

https://dmesgd.nycbug.org/index.cgi?do=view&id=8022

Nick