MAINTAINERS: Change reviewer of the ECLAIR integration

Simone Ballarin is no longer actively involved in reviewing
the ECLAIR integration for Xen. I am stepping up as a reviewer.

Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Simone Ballarin <simone.ballarin@bugseng.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>

MAINTAINERS

@@ -297,7 +297,7 @@ F:	xen/include/xen/device_tree.h
 F:	xen/drivers/passthrough/device_tree.c
 
 ECLAIR
-R:	Simone Ballarin <simone.ballarin@bugseng.com>
+R:	Nicola Vetrini <nicola.vetrini@bugseng.com>
 S:	Supported
 F:	automation/eclair_analysis/
 F:	automation/scripts/eclair