THE_PACKAGES_REGEXP is in place, let's rebase firmware packages
so these would be available in LiveCDs either.

The news for systems being installed is that MAIN_* is optional
while THE_* is included in base system; firmware packages tend
to be pretty tiny and harmless.

kernel-wifi pkglist has absolutely no sense by now, hence purged;
firmware-rt* and firmware-i2400m are merged into firmware-linux.