sepolicy[6/8]: allow vold to create files on external sdcard

This is required for ASEC support. Vold can already create and
access directories, but do not yet have the permission for files.

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: I5082bbff692e5dc53c7000e4b3a293e42d33f901
diff --git a/sepolicy/vold.te b/sepolicy/vold.te
index 40372db..af1754d 100644
--- a/sepolicy/vold.te
+++ b/sepolicy/vold.te
@@ -11,3 +11,6 @@
 # Allow vold to relabel sdcard fs mounts
 allow vold unlabeled:filesystem { relabelfrom };
 allow vold sdcard_external:filesystem { relabelfrom relabelto };
+
+# Allow vold to manage ASEC
+allow vold sdcard_external:file create_file_perms;