MAINTAINERS: append initramfs files to the VFS section

At the moment it's a little unclear where initramfs patches should be
sent. This should see them end up on the linux-fsdevel mailing list.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Link: https://lore.kernel.org/r/20250318040711.20683-1-ddiss@suse.de
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: ddiss

MAINTAINERS

@@ -8896,6 +8896,9 @@ F:	include/linux/fs.h
 F:	include/linux/fs_types.h
 F:	include/uapi/linux/fs.h
 F:	include/uapi/linux/openat2.h
+F:	Documentation/driver-api/early-userspace/buffer-format.rst
+F:	init/do_mounts*
+F:	init/*initramfs*
 
 FILESYSTEMS [EXPORTFS]
 M:	Chuck Lever <chuck.lever@oracle.com>