With the new driver, MAC addresses are not set up in DTS anymore,
and therefore label-mac-device will be useless there.
Setup is done properly in 02_network, so this just removes the
obsolete alias.
Fixes: 5e50515fa6 ("ramips/mt7621: mikrotik: don't use
mtd-mac-address in DTS")
Suggested-by: John Thomson <git@johnthomson.fastmail.com.au>
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
96c8960aad