build: fix including busybox, procd and apk/opkg in imagebuilder

build: fix including busybox, procd and apk/opkg in imagebuilder

Since the image builder pulls package lists from metadata directly,
add procd and busybox as depdendencies to base-files.
As for the package manager itself, since it can be disabled it needs
to be added directly in the image builder makefile

Fixes: 44598c233dd9 ("build: remove broken dependency of metadata on toplevel .config variables")
Signed-off-by: Felix Fietkau <nbd@nbd.name>