Create getSystemSelectionChannel API

Test: atest TelephonyManagerTest
Test: atest VtsHalRadioV1_6TargetTest
Bug: 152813408
Change-Id: I6f3f70b7ff1b876ec98086431ed5c557875fca85
Merged-In: I6f3f70b7ff1b876ec98086431ed5c557875fca85
diff --git a/radio/1.6/IRadio.hal b/radio/1.6/IRadio.hal
index 8afbf22..7f874c6 100644
--- a/radio/1.6/IRadio.hal
+++ b/radio/1.6/IRadio.hal
@@ -349,4 +349,13 @@
     oneway setDataThrottling(int32_t serial,
             DataThrottlingAction dataThrottlingAction,
             int32_t completionWindowSecs);
+
+    /**
+     * Get which bands the modem's background scan is acting on.
+     *
+     * @param serial Serial number of request.
+     *
+     * Response callback is IRadioResponse.getSystemSelectionChannelsResponse()
+     */
+    oneway getSystemSelectionChannels(int32_t serial);
 };