Prepare necessary data directory before loading persistent properties.

init reads files in /data/property/ but it is not ready to read when
trigger_load_persist_props is triggered by vold.decrypt.

Bug: 29332975
Change-Id: I14beac8714ff2f722d8b11f666bc7ca693ccd46e
(cherry picked from commit e2ef0c0da454a5b9224d340260e9ad5be46092fe)
diff --git a/cryptfs.c b/cryptfs.c
index b1d1fc7..53624ce 100644
--- a/cryptfs.c
+++ b/cryptfs.c
@@ -1716,11 +1716,11 @@
             return -1;
         }
 
-        property_set("vold.decrypt", "trigger_load_persist_props");
         /* Create necessary paths on /data */
         if (prep_data_fs()) {
             return -1;
         }
+        property_set("vold.decrypt", "trigger_load_persist_props");
 
         /* startup service classes main and late_start */
         property_set("vold.decrypt", "trigger_restart_framework");