tier-0: add dnf for building derived images

Signed-off-by: Paul Whalen <pwhalen@fedoraproject.org>

tier-1/manifest.yaml

@@ -4,7 +4,6 @@ recommends: true
 include:
   - manifest-tier-0.yaml
   - bootable-rpm-ostree.yaml
-  - rpm-packaging.yaml
   - podman.yaml
   - firmware.yaml
   - networking-tools.yaml

tier-1/rpm-packaging.yaml

@@ -1,4 +0,0 @@
-# A full dnf experience at build time, but right now
-# `dnf update` *client side* doesn't do much helpful...
-packages:
-  - dnf