um: Add arch/x86/um to MAINTAINERS

Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/MAINTAINERS b/MAINTAINERS
index fe643e7..f13d107 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7305,6 +7305,7 @@
 S:	Maintained
 F:	Documentation/virtual/uml/
 F:	arch/um/
+F:	arch/x86/um/
 F:	fs/hostfs/
 F:	fs/hppfs/