MAINTAINERS: Tamás Lengyel to maintain mem-sharing

The component being unmaintained right now and him being the apparently
only user at present, this certainly is an improvement over the current
situation.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Tamas K Lengyel <tamas@tklengyel.com>

MAINTAINERS

@@ -369,10 +369,14 @@ M:	George Dunlap <george.dunlap@eu.citrix.com>
 S:	Supported
 F:	xen/arch/x86/mm/
 
-X86 MEMORY SHARING AND PAGING
+X86 MEMORY PAGING
 S:	Orphaned
-F:	xen/arch/x86/mm/mem_sharing.c
 F:	xen/arch/x86/mm/mem_paging.c
+
+X86 MEMORY SHARING
+M:	Tamas K Lengyel <tamas@tklengyel.com>
+S:	Odd Fixes
+F:	xen/arch/x86/mm/mem_sharing.c
 F:	tools/memshr
 
 X86 SHADOW PAGETABLES