Create getSystemSelectionChannel API

Test: atest TelephonyManagerTest
Test: atest VtsHalRadioV1_6TargetTest
Bug: 152813408
Change-Id: I6f3f70b7ff1b876ec98086431ed5c557875fca85
Merged-In: I6f3f70b7ff1b876ec98086431ed5c557875fca85
diff --git a/radio/1.6/vts/functional/radio_response.cpp b/radio/1.6/vts/functional/radio_response.cpp
index 788038a..7da675e 100644
--- a/radio/1.6/vts/functional/radio_response.cpp
+++ b/radio/1.6/vts/functional/radio_response.cpp
@@ -1163,3 +1163,10 @@
     parent_v1_6.notify(info.serial);
     return Void();
 }
+
+Return<void> RadioResponse_v1_6::getSystemSelectionChannelsResponse(
+        const ::android::hardware::radio::V1_6::RadioResponseInfo& info) {
+    rspInfo = info;
+    parent_v1_6.notify(info.serial);
+    return Void();
+}