kexec: Reserve hypercall number

This is a micro-excerpt from the kexec patches that
are being worked on. It just reserves hypercall number 35
ensure that is isn't a moving target.

Cc: Magnus Damm <magnus@xxxxxxxxxxxxx>
Signed-Off-By: Simon Horman <horms@xxxxxxxxxxxx>

--- 0001/xen/include/public/xen.h
+++ work/xen/include/public/xen.h	2006-08-21 13:06:15.000000000 +0900
@@ -61,6 +61,7 @@
 #define __HYPERVISOR_event_channel_op     32
 #define __HYPERVISOR_physdev_op           33
 #define __HYPERVISOR_hvm_op               34
+#define __HYPERVISOR_kexec_op             35
 
 /* Architecture-specific hypercall definitions. */
 #define __HYPERVISOR_arch_0               48