Install systemd services with autotools

Change-Id: Ia1a4fb62dee35737ece1f3501f352501eba2449e
diff --git a/debian/osmo-trx-uhd.install b/debian/osmo-trx-uhd.install
index 8944b13..b7ec5ca 100644
--- a/debian/osmo-trx-uhd.install
+++ b/debian/osmo-trx-uhd.install
@@ -1,3 +1,4 @@
+lib/systemd/system/osmo-trx-uhd.service
 /usr/bin/osmo-trx-uhd
 /usr/share/doc/osmo-trx/examples/osmo-trx-uhd/osmo-trx-usrp_b200.cfg /usr/share/doc/osmo-trx/examples/osmo-trx-uhd/
 /usr/share/doc/osmo-trx/examples/osmo-trx-uhd/osmo-trx-limesdr.cfg /usr/share/doc/osmo-trx/examples/osmo-trx-uhd/