selinux: Add a rule to label the extended keyhandler dex files

These should be treated as regular dex cache files, but they're
expanded outside of the normal cache dir

Change-Id: Id046e1b90116b35d2e7817ed4717fcef78135f08
diff --git a/sepolicy/system.te b/sepolicy/system.te
index 4c6de38..01972d4 100644
--- a/sepolicy/system.te
+++ b/sepolicy/system.te
@@ -1 +1,2 @@
 allow system_server wallpaper_file:file relabelto;
+allow system_server dalvikcache_data_file:file write;