Add `%triggerun` to call systemctl preset for systemd-oomd

Signed-off-by: Michel Alexandre Salim <salimma@fedoraproject.org>

systemd.spec

@@ -755,6 +755,10 @@ if systemctl -q is-enabled systemd-resolved.service &>/dev/null; then
   systemctl start systemd-resolved.service &>/dev/null || :
 fi
 
+%triggerun -- systemd < 247.3-2
+# This is for upgrades from previous versions before oomd-defaults is available
+systemctl --no-reload preset systemd-oomd.service &>/dev/null || :
+
 %post libs
 %{?ldconfig}