vendor: add exfat and ntfs perms for vold

Change-Id: Ia350d6373f13de4dfab9c2fc6456d8d53de554a9
diff --git a/sepolicy/sepolicy.mk b/sepolicy/sepolicy.mk
index 3759983..658562b 100644
--- a/sepolicy/sepolicy.mk
+++ b/sepolicy/sepolicy.mk
@@ -7,3 +7,4 @@
     vendor/omni/sepolicy/common
 
 BOARD_PLAT_PRIVATE_SEPOLICY_DIR += vendor/omni/sepolicy/private
+BOARD_PLAT_PUBLIC_SEPOLICY_DIR += vendor/omni/sepolicy/public