Only configure the eth0 MAC address when it is not already done in the
device tree. To do this, create a new variable "eth0_mac".
Also avoid setting "label_mac" for devices already having it defined in
the device tree.
Signed-off-by: Jan Hoffmann <jan@3e8.eu>
Link: https://github.com/openwrt/openwrt/pull/21644
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
08ab732b25