VFS: Unexport do_kern_mount() and clean up simple_pin_fs()

Replace all module uses with the new vfs_kern_mount() interface, and fix up
simple_pin_fs().

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/security/inode.c b/security/inode.c
index 0f77b02..8bf4062 100644
--- a/security/inode.c
+++ b/security/inode.c
@@ -224,7 +224,7 @@
 
 	pr_debug("securityfs: creating file '%s'\n",name);
 
-	error = simple_pin_fs("securityfs", &mount, &mount_count);
+	error = simple_pin_fs(&fs_type, &mount, &mount_count);
 	if (error) {
 		dentry = ERR_PTR(error);
 		goto exit;