cm: sepolicy: fix denials for external storage

Change-Id: I784a859671c69370cab0118a88a5fb0190352af9
diff --git a/sepolicy/genfs_contexts b/sepolicy/genfs_contexts
index cec9f01..b39d3dd 100644
--- a/sepolicy/genfs_contexts
+++ b/sepolicy/genfs_contexts
@@ -1 +1,3 @@
 genfscon fuseblk / u:object_r:sdcard_external:s0
+genfscon exfat / u:object_r:sdcard_external:s0
+genfscon ntfs / u:object_r:sdcard_external:s0