Add MODIFY_PHONE_STATE permission to access Bluetooth service in Phone app

Enforce MODIFY_PHONE_STATE permission for some HeadsetService APIs that
only provided for Phone app for phone stat change notifications
bug 7115021

Change-Id: I62e3f429f4205feb50e123ee94b4c468999804a6
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index c73d92f..e139859 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -43,6 +43,7 @@
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
     <uses-permission android:name="android.permission.CONNECTIVITY_INTERNAL" />
+    <uses-permission android:name="android.permission.MODIFY_PHONE_STATE" />
     <!-- For PBAP Owner Vcard Info -->
     <uses-permission android:name="android.permission.READ_PROFILE"/>
     <application