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