This drops a use of downstream "mac-address-increment".
Cc: Christian Svensson <blue@cmd.nu>
Cc: Tommy Nevtelen <tommy@nevtelen.com>
Cc: Viktor Ekmark <viktor@ekmark.se>
Cc: Daniel Wennberg <github@networkninja.se>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Tested-by: Christian Svensson <blue@cmd.nu>