If nvmem is used for ethernet mac address, we need to defer loading to
get the proper mac.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/21955
Signed-off-by: Robert Marko <robimarko@gmail.com>
(cherry picked from commit fb71774232)