COSMIC: Add power-profiles-daemon

Make sure that at least one power profile manager daemon is included.

Use `power-profiles-daemon` for now until support is added in tuned-ppd
and cosmic-settings.

See: pop-os/cosmic-settings#482
See: redhat-performance/tuned#684
See: https://fedoraproject.org/wiki/Changes/TunedAsTheDefaultPowerProfileManagementDaemon

cosmic-atomic.yaml

@@ -17,6 +17,8 @@ packages:
   - xdg-desktop-portal-gtk
   # Include GUI to manage updates & Flatpaks
   - gnome-software
+  # Power management. Expected to be droped for tuned-ppd
+  - power-profiles-daemon
 
 # Kept in the leaf manifest as they are overwritten by Pungi in composes
 repos: