Create getSystemSelectionChannel API

Test: atest TelephonyManagerTest
Test: atest VtsHalRadioV1_6TargetTest
Bug: 152813408
Change-Id: I6f3f70b7ff1b876ec98086431ed5c557875fca85
Merged-In: I6f3f70b7ff1b876ec98086431ed5c557875fca85
diff --git a/radio/1.6/IRadioResponse.hal b/radio/1.6/IRadioResponse.hal
index 5a71c1f..c545db0 100644
--- a/radio/1.6/IRadioResponse.hal
+++ b/radio/1.6/IRadioResponse.hal
@@ -317,4 +317,15 @@
      *  RadioError:INVALID_ARGUMENTS
      */
     oneway setDataThrottlingResponse(RadioResponseInfo info);
+
+    /**
+     * @param info Response info struct containing response type, serial no. and error
+     *
+     * Valid errors returned:
+     *   RadioError:NONE
+     *   RadioError:RADIO_NOT_AVAILABLE
+     *   RadioError:INTERNAL_ERR
+     *   RadioError:INVALID_ARGUMENTS
+     */
+    oneway getSystemSelectionChannelsResponse(RadioResponseInfo info);
 };