Move PatriciaTrieReadingUtils under pt_common.

Change-Id: Ib8ec62b97318563785a2aafb854aabdc3f46f187
diff --git a/native/jni/NativeFileList.mk b/native/jni/NativeFileList.mk
index 70a6638..34c1907 100644
--- a/native/jni/NativeFileList.mk
+++ b/native/jni/NativeFileList.mk
@@ -56,10 +56,10 @@
         dynamic_pt_reading_helper.cpp \
         dynamic_pt_reading_utils.cpp \
         dynamic_pt_updating_helper.cpp \
-        dynamic_pt_writing_utils.cpp) \
+        dynamic_pt_writing_utils.cpp \
+        patricia_trie_reading_utils.cpp) \
     $(addprefix suggest/policyimpl/dictionary/structure/v2/, \
         patricia_trie_policy.cpp \
-        patricia_trie_reading_utils.cpp \
         ver2_patricia_trie_node_reader.cpp \
         ver2_pt_node_array_reader.cpp) \
     $(addprefix suggest/policyimpl/dictionary/structure/v4/, \