Bug#1025106: Phone crash in non-system-user mode after user input PUK code.

[root cause  ]SpecialCharSequenceMgr didn't check SystemUser in handlePinEntry method
[changes     ]phone crash in non-system-user mode after input PUK code
[issue address]https://partnerissuetracker.corp.google.com/u/0/issues/128496199

Change-Id: Ic3c53930c5ac11a972f02d21980f91c334d60901
diff --git a/res/values/strings.xml b/res/values/strings.xml
index dd8abe7..2b9291c 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -1190,6 +1190,9 @@
          emergency calling is not currently available. -->
     <string name="dial_emergency_calling_not_available">Emergency calling not available</string>
 
+    <!-- Only handle pin entry when phone user is system-->
+    <string name="pin_puk_system_user_only">Only the owner of the device can enter PIN/PUK codes.</string>
+
     <!-- Text for description of police calling type -->
     <string name="police_type_description">Police</string>
     <!-- Text for description of ambulance calling type -->