Add NTFS support in sepolicy.

This CR, when paired with a functional NTFS implementation and the
corresponding vold updates, will allow NTFS USB drives to be mounted
on Android.

Bug: 254407246

Test: Extensive testing with NTFS USB drives.
Change-Id: I259882854ac40783f6d1cf511e8313b1d5a04eef
diff --git a/private/genfs_contexts b/private/genfs_contexts
index 6578470..29d8561 100644
--- a/private/genfs_contexts
+++ b/private/genfs_contexts
@@ -385,6 +385,7 @@
 genfscon vfat / u:object_r:vfat:s0
 genfscon binder / u:object_r:binderfs:s0
 genfscon exfat / u:object_r:exfat:s0
+genfscon ntfs / u:object_r:ntfs:s0
 genfscon debugfs / u:object_r:debugfs:s0
 genfscon fuse / u:object_r:fuse:s0
 genfscon configfs / u:object_r:configfs:s0