MAINTAINERS: Promote Cédric to VFIO co-maintainer

Cédric has stepped up involvement in vfio, reviewing and managing
patches, as well as pull requests.  This work deserves gratitude and
punishment with a promotion to co-maintainer ;)

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>

MAINTAINERS

@@ -2051,7 +2051,7 @@ F: hw/usb/dev-serial.c
 
 VFIO
 M: Alex Williamson <alex.williamson@redhat.com>
-R: Cédric Le Goater <clg@redhat.com>
+M: Cédric Le Goater <clg@redhat.com>
 S: Supported
 F: hw/vfio/*
 F: include/hw/vfio/