require polkit service from ModemManager package

When building ModemManager with --with-polkit=, the ModemManager.service
"Requires=polkit". It becomes a strict package dependency. Add the
dependency.

Fixes: 2c31de07cd

Resolves: #1995186

ModemManager.spec

@@ -4,7 +4,7 @@
 
 Name: ModemManager
 Version: 1.14.10
-Release: 5%{?dist}
+Release: 6%{?dist}
 Summary: Mobile broadband modem management service
 License: GPLv2+
 URL: http://www.freedesktop.org/wiki/Software/ModemManager/
@@ -25,6 +25,8 @@ Requires(post): systemd
 Requires(postun): systemd
 Requires(preun): systemd
 
+Requires: polkit
+
 BuildRequires: automake autoconf libtool autoconf-archive
 BuildRequires: dbus
 BuildRequires: dbus-daemon
@@ -170,6 +172,9 @@ find %{buildroot} -type f -name "*.la" -delete
 %{_datadir}/vala/vapi/libmm-glib.*
 
 %changelog
+* Fri Aug 20 2021 Thomas Haller <thaller@redhat.com> - 1.14.10-6
+- depend ModemManager on polkit package (rh #1995186)
+
 * Thu Aug 19 2021 Thomas Haller <thaller@redhat.com> - 1.14.10-5
 - enable polkit support to allow normal users to access modems (rh #1995186)