systemd-conf: Accept MTU from DHCP
Many local cloud deployments use MTUs other than 1500. To support
them, accept MTU from DHCP by default.
(From OE-Core rev: 60ff220548125bbdc6812669af711fb3650d87aa)
Signed-off-by: Daniel McGregor <daniel.mcgregor@vecima.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>