sepolicy: Underp the context for persistent storage

The dir's context need love, too

TICKET: CYNGNOS-1185
Change-Id: I659b3ba06079825fe850cf66858a9d98b5f61c46
diff --git a/sepolicy/file_contexts b/sepolicy/file_contexts
index c706a5d..8985b5c 100644
--- a/sepolicy/file_contexts
+++ b/sepolicy/file_contexts
@@ -36,7 +36,7 @@
 /data/system/users/[0-9]+/keyguard_wallpaper   u:object_r:wallpaper_file:s0
 
 # Persistent properties
-/persist/properties         u:object_r:persist_property_file:s0
+/persist/properties(/.*)?         u:object_r:persist_property_file:s0
 
 # LiveDisplay
 /sys/devices/virtual/graphics/fb0/aco           u:object_r:livedisplay_sysfs:s0