Allow vold to create files at /mnt/user/.*

Bug: 121099965
Test: manual
Change-Id: I940868eb984399763d7346a201e37cb07fb12333
diff --git a/public/vold.te b/public/vold.te
index 7e71f16..14286c4 100644
--- a/public/vold.te
+++ b/public/vold.te
@@ -78,6 +78,7 @@
 # Manage per-user primary symlinks
 allow vold mnt_user_file:dir { create_dir_perms mounton };
 allow vold mnt_user_file:lnk_file create_file_perms;
+allow vold mnt_user_file:file create_file_perms;
 
 # Allow to create and mount expanded storage
 allow vold mnt_expand_file:dir { create_dir_perms mounton };