New maintainers for VM events and memory access.

Razvan and Tamas have been working on this code for a while now, and
have kindly agreed to act as maintainers.

Signed-off-by: Tim Deegan <tim@xen.org>
Acked-by: Tamas K Lengyel <tlengyel@novetta.com>
Acked-by: Razvan Cojocaru <rcojocaru@bitdefender.com>

MAINTAINERS

@@ -375,7 +375,8 @@ F:	xen/arch/x86/mm/mem_paging.c
 F:	tools/memshr
 
 VM EVENT AND MEM ACCESS
-M:	Tim Deegan <tim@xen.org>
+M:	Razvan Cojocaru <rcojocaru@bitdefender.com>
+M:	Tamas K Lengyel <tlengyel@novetta.com>
 S:	Supported
 F:	xen/common/vm_event.c
 F:	xen/common/mem_access.c