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/vts/functional/radio_indication.cpp b/radio/1.6/vts/functional/radio_indication.cpp
index 4dffe63..bfc54c0 100644
--- a/radio/1.6/vts/functional/radio_indication.cpp
+++ b/radio/1.6/vts/functional/radio_indication.cpp
@@ -387,6 +387,12 @@
     return Void();
 }
 
+Return<void> RadioIndication_v1_6::currentSignalStrength_1_6(
+        RadioIndicationType /*type*/,
+        const ::android::hardware::radio::V1_6::SignalStrength& /*signalStrength*/) {
+    return Void();
+}
+
 Return<void> RadioIndication_v1_6::networkScanResult_1_6(
         RadioIndicationType /*type*/,
         const ::android::hardware::radio::V1_6::NetworkScanResult& /*result*/) {