Needed by GNOME Software since
https://gitlab.alpinelinux.org/Cogitri/apk-polkit-rs/-/merge_requests/45
GNOME Software is often installed in GNOME UI's through pmb_recommends,
but it's not a dependency in any way. To avoid spilling this service
enablement everywhere, add just the openrc subpackage from the daemon.
That means that if GNOME Software is not installed or gets uninstalled,
the daemon will crash on startup. That should not be a big deal though.
[ci:skip-build] already built successfully in CI
Closes https://gitlab.com/postmarketOS/pmaports/-/issues/1936
Additionally, this means that iio-sensor-proxy actually gets enabled
on GNOME and GNOME mobile. Previously, it would get installed there
but not enabled unless the user manually did it.
