sitlinv_stlv7325: allow to set local/remote ip
sitlinv_stlv7325: allow to set local/remote ip

Port the script snippet from Colorlight i5 for setting the local/remote
IP address to STLV7325.

Signed-off-by: Icenowy Zheng <f46fab9f9f91073a4262a6bce61dc3d05ad0a078@icenowy.me>

litex-hub/litex-boards