Support telephoy command to set test mode for RCS single registration

Bug: 181054754
Test: Manual
Change-Id: Id34c212e536b47c61bc1939ef056905fc26b4df2
diff --git a/telephony/java/com/android/internal/telephony/ITelephony.aidl b/telephony/java/com/android/internal/telephony/ITelephony.aidl
index 1d04953..d3a584a 100644
--- a/telephony/java/com/android/internal/telephony/ITelephony.aidl
+++ b/telephony/java/com/android/internal/telephony/ITelephony.aidl
@@ -2320,6 +2320,16 @@
     void triggerRcsReconfiguration(int subId);
 
     /**
+     * Enables or disables the test mode for RCS VoLTE single registration.
+     */
+    void setRcsSingleRegistrationTestModeEnabled(boolean enabled);
+
+    /**
+     * Gets the test mode for RCS VoLTE single registration.
+     */
+    boolean getRcsSingleRegistrationTestModeEnabled();
+
+    /**
      * Overrides the config of RCS VoLTE single registration enabled for the device.
      */
     void setDeviceSingleRegistrationEnabledOverride(String enabled);