Convert telephonyIsVoiceCapable() to return Boolean

Bug:28641815
Change-Id: Ie595d01eb6f106a97a006149c466e252a6c9735c
diff --git a/Common/src/com/googlecode/android_scripting/facade/telephony/TelephonyManagerFacade.java b/Common/src/com/googlecode/android_scripting/facade/telephony/TelephonyManagerFacade.java
index ad024c7..9206798 100644
--- a/Common/src/com/googlecode/android_scripting/facade/telephony/TelephonyManagerFacade.java
+++ b/Common/src/com/googlecode/android_scripting/facade/telephony/TelephonyManagerFacade.java
@@ -191,7 +191,7 @@
     }
 
     @Rpc(description = "Get if phone have voice capability")
-    public boolean telephonyIsVoiceCapable() {
+    public Boolean telephonyIsVoiceCapable() {
         return mTelephonyManager.isVoiceCapable();
     }