MAINTAINERS: Change tmem maintainer

Konrad has graduated to becoming an maintainer in the Xen hypervisor.

Acked-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

MAINTAINERS

@@ -262,7 +262,7 @@ S:	Supported
 F:	tools/
 
 TRANSCENDENT MEMORY (TMEM)
-M:	Dan Magenheimer <dan.magenheimer@oracle.com>
+M:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
 W:	http://oss.oracle.com/projects/tmem
 S:	Supported
 F:	xen/common/tmem*