MAINTAINERS: cover non-x86 vm_event files

This patch covers modifications to xen/arch/*/vm_event.c, in order
to include ARM vm_event maintainership.

Signed-off-by: Razvan Cojocaru <rcojocaru@bitdefender.com>
Acked-by: Tamas K Lengyel <tamas@tklengyel.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

MAINTAINERS

@@ -362,7 +362,7 @@ F:	xen/common/vm_event.c
 F:	xen/common/mem_access.c
 F:	xen/arch/x86/hvm/event.c
 F:	xen/arch/x86/monitor.c
-F:	xen/arch/x86/vm_event.c
+F:	xen/arch/*/vm_event.c
 F:	tools/tests/xen-access
 
 VTPM