srs_ue: add scenario for airplane mode simulation in srsUE

Change-Id: I5db2ff325ce4b4236c1ceec0831dd7420d52dedb
diff --git a/example/scenarios/mod-srsue-airplane_mode_sim@.conf b/example/scenarios/mod-srsue-airplane_mode_sim@.conf
new file mode 100644
index 0000000..c05fba1
--- /dev/null
+++ b/example/scenarios/mod-srsue-airplane_mode_sim@.conf
@@ -0,0 +1,4 @@
+modifiers:
+  modem:
+    - airplane_t_on_ms: ${param1}
+      airplane_t_off_ms: ${param2}