Code cleanup. Simplify and unify how kernel image is passed to
Build/dna-bootfs
Signed-off-by: Mauri Sandberg <maukka@ext.kapsi.fi>
Link: https://github.com/openwrt/openwrt/pull/16811
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit ec839c786c)
Link: https://github.com/openwrt/openwrt/pull/17097
Signed-off-by: Petr Štetiar <ynezz@true.cz>