Revert the recent dependency and metadata scanning rework

Revert the recent dependency and metadata scanning rework

This reverts the following commits:
fbe522d1204149b6c128d55e360bfc15fa8258e1
278ad007ee03c4455c3507322e34b0e3e6ec050d
863888e44f7a1fb1675a2e7a2eaabfec3561d2a2
96daf6352f6e04bc22789466cb5409b93fbec191
cfd83555fc4f0bab18a26f6812da18e64df46ff3

This seems to trigger some mconf bugs when built with all feeds
packages, so I will try to find a less intrusive solution before the
release.

Signed-off-by: Felix Fietkau <nbd@nbd.name>