Install sample cfg file to /etc/osmocom

Change-Id: Ib871a3cd14386ef6e6b512a3d66e7e7a839295a5
diff --git a/debian/osmo-trx-lms.install b/debian/osmo-trx-lms.install
index b58c862..b89506a 100644
--- a/debian/osmo-trx-lms.install
+++ b/debian/osmo-trx-lms.install
@@ -1,3 +1,4 @@
+etc/osmocom/osmo-trx-lms.cfg
 lib/systemd/system/osmo-trx-lms.service
 /usr/bin/osmo-trx-lms
 /usr/share/doc/osmo-trx/examples/osmo-trx-lms/osmo-trx-limesdr.cfg /usr/share/doc/osmo-trx/examples/osmo-trx-lms/