enigma2: List packages before defining their runtime dependencies

Prevents QA warnings like:
WARNING: QA Issue: enigma2-plugin-extensions-cutlisteditor rdepends on aio-grab but its not a build dependency? [build-deps]
enigma2: Removed modem and disabled DVDburn plugin

Both plugins lack dependencies, and cannot be installed.
Revert "enigma2: List packages before defining their runtime dependencies"

Adding plugins to the PACKAGES list makes them mysteriously disappear. No
time to investigate, so revert the commit for now.

This reverts commit e6dbac724f1d459bceb8fc5c5fef4c76347719dd.
Merge branch 'master' of git://git.code.sf.net/p/openpli/openpli-oe-core