As per #19596 - this allows eg, modifying the bootcmd etc.
This has been useful when testing on e.g the -48, where `rtk network on` is required for the SFP ports.
Signed-off-by: Joe Holden <jwh@zorins.us>
Link: https://github.com/openwrt/openwrt/pull/19913
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>