Add very simplistic DF_PHONEBOOK support

This at least gives us the names for the DF and those EFs inside.

Change-Id: I12f70ae78e219e765ecb44cacff421d64c7b3f19
diff --git a/pySim/ts_51_011.py b/pySim/ts_51_011.py
index 209a273..e4cbfd2 100644
--- a/pySim/ts_51_011.py
+++ b/pySim/ts_51_011.py
@@ -32,6 +32,7 @@
 from pySim.profile import match_sim
 from pySim.profile import CardProfile
 from pySim.filesystem import *
+from pySim.ts_31_102_telecom import DF_PHONEBOOK
 import enum
 from pySim.construct import *
 from construct import Optional as COptional
@@ -497,6 +498,8 @@
             EF_EXT('6f4e', None, 'EF.EXT4', 'Extension4 (BDN/SSC)'),
             EF_SMSR(),
             EF_CMI(),
+            # not really part of 51.011 but something that TS 31.102 specifies may exist here.
+            DF_PHONEBOOK(),
         ]
         self.add_files(files)