Update Hal 1.6 for updated SignalStength

Update Hal IRadio, IRadioResponse, and IRadioIndiction
for the updated SignalSterength.
Move radio_responce#getSignalStrengthResponse_1_4 to the right block

Bug: 174775680
Test: atest VtsHalRadioV1_6TargetTest
Change-Id: If61ff4f72b44ac5482acd1823153633d5f9bfce9
diff --git a/radio/1.6/IRadio.hal b/radio/1.6/IRadio.hal
index a911439..d13e8d0 100644
--- a/radio/1.6/IRadio.hal
+++ b/radio/1.6/IRadio.hal
@@ -390,6 +390,15 @@
     oneway getVoiceRegistrationState_1_6(int32_t serial);
 
     /**
+     * Requests current signal strength and associated information.  Must succeed if radio is on.
+     *
+     * @param serial Serial number of request.
+     *
+     * Response function is IRadioResponse.getSignalStrengthResponse_1_6()
+     */
+    oneway getSignalStrength_1_6(int32_t serial);
+
+    /**
      * Request current data registration state.
      *
      * @param serial Serial number of request.