Allow setting MTU for Rockchip64's dwmac interface

Description

Currently there is no way to change the MTU of dwmac based interfaces:
https://forum.armbian.com/topic/15431-helios64-support/?do=findComment&comment=111854

Done

Assignee

Piotr Szczepanik

Reporter

Piotr Szczepanik

Components

Labels

None

Fix versions

Priority

Medium