fedora-common-ostree: Enable bootupd integration

Now that we're building using unified core and that Anaconda has support
for bootupd, we can enable bootupd in Silverblue & friends.

See: https://fedoraproject.org/wiki/Changes/FedoraSilverblueBootupd
See: https://fedoraproject.org/wiki/Changes/FedoraSilverblueUnifiedCore

Previous attempts:
- https://pagure.io/workstation-ostree-config/pull-request/288
- https://pagure.io/workstation-ostree-config/pull-request/293
- https://pagure.io/workstation-ostree-config/pull-request/307
- https://pagure.io/workstation-ostree-config/pull-request/313 (revert)
- https://pagure.io/workstation-ostree-config/pull-request/330
- https://pagure.io/workstation-ostree-config/pull-request/402 (revert)

fedora-common-ostree.yaml

@@ -10,12 +10,10 @@ container-cmd:
 include: fedora-common-ostree-pkgs.yaml
 
 # See https://github.com/coreos/bootupd
-# TODO: Disabled until we use use unified-core or native container flow
-# for the main build
-# arch-include:
-#   x86_64: bootupd.yaml
-#   aarch64: bootupd.yaml
-#   ppc64le: bootupd.yaml
+arch-include:
+  x86_64: bootupd.yaml
+  aarch64: bootupd.yaml
+  ppc64le: bootupd.yaml
 
 packages:
   # Ensure that we have a kernel. Kernel packages are not in any comps group