Add a new vts directory under 1.1 for radio 1.1 APIs vts tests.

Bug: 38034125
Test: compile; adb shell compiled_vts_binary
Change-Id: I05d4f03db40ac712f120ac0e3e52301a6252f041
diff --git a/radio/Android.bp b/radio/Android.bp
index dbeca0c..0acb2ee 100644
--- a/radio/Android.bp
+++ b/radio/Android.bp
@@ -3,5 +3,6 @@
     "1.0",
     "1.0/vts/functional",
     "1.1",
+    "1.1/vts/functional",
     "deprecated/1.0",
 ]