MAINTAINERS: declare REMUS support orphaned

The designated maintainer email address for the remus entry is
bouncing, so remove it and declare the entry as orphaned as there's no
other maintainer.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Ian Jackson <iwj@xenproject.org>

MAINTAINERS

@@ -470,8 +470,7 @@ S:	Supported
 T:	git https://xenbits.xenproject.org/git-http/qemu-xen.git
 
 REMUS
-M:	Shriram Rajagopalan <rshriram@cs.ubc.ca>
-S:	Maintained
+S:	Orphan
 F:	docs/README.remus
 F:	tools/libs/light/libxl_remus_*
 F:	tools/libs/light/libxl_netbuffer.c