train info persist to disk sepolicy

Test: will add gts
Bug: 122807604
Change-Id: I60d2b207d8cf652ff90111cc5bef996f14d93376
diff --git a/private/file_contexts b/private/file_contexts
index 233d5f4..97352a5 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -489,6 +489,7 @@
 /data/misc/stats-service(/.*)?  u:object_r:stats_data_file:s0
 /data/misc/systemkeys(/.*)?     u:object_r:systemkeys_data_file:s0
 /data/misc/textclassifier(/.*)?       u:object_r:textclassifier_data_file:s0
+/data/misc/train-info(/.*)?     u:object_r:stats_data_file:s0
 /data/misc/user(/.*)?           u:object_r:misc_user_data_file:s0
 /data/misc/vpn(/.*)?            u:object_r:vpn_data_file:s0
 /data/misc/wifi(/.*)?           u:object_r:wifi_data_file:s0