Revert "SELinux: allow fstype unknown to policy to use xattrs if present"

This reverts commit 811f379927.

From Eric Paris:

"Please drop this patch for now.  It deadlocks on ntfs-3g.  I need to
rework it to handle fuse filesystems better.  (casey was right)"

security/selinux/include/security.h

@@ -136,7 +136,7 @@ int security_get_allow_unknown(void);
 #define SECURITY_FS_USE_MNTPOINT	6 /* use mountpoint labeling */
 
 int security_fs_use(const char *fstype, unsigned int *behavior,
-	u32 *sid, bool can_xattr);
+	u32 *sid);
 
 int security_genfs_sid(const char *fstype, char *name, u16 sclass,
 	u32 *sid);