This aligns the device/image names of the older Xiaomi Mi Router
devices with their "friendly" model and DEVICE_MODEL properties.
This also reintroduces consistency with the newer devices already
following that scheme.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Signed-off-by: maurerr <mariusd84@gmail.com>
