vfio: Add Cornelia Huck as reviewer

I'm trying to look at vfio patches, and it's easier if I'm cc:ed.
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

MAINTAINERS

@@ -16382,6 +16382,7 @@ F:	fs/fat/
 
 VFIO DRIVER
 M:	Alex Williamson <alex.williamson@redhat.com>
+R:	Cornelia Huck <cohuck@redhat.com>
 L:	kvm@vger.kernel.org
 T:	git git://github.com/awilliam/linux-vfio.git
 S:	Maintained