Clean up duplicate includes in arch/i386/xen/

This patch cleans up duplicate includes in
	arch/i386/xen/
Signed-off-by: NJesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: NJeremy Fitzhardinge <jeremy@xensource.com>

arch/x86/xen/enlighten.c

@@ -25,7 +25,6 @@
 #include <linux/mm.h>
 #include <linux/page-flags.h>
 #include <linux/highmem.h>
-#include <linux/smp.h>
 
 #include <xen/interface/xen.h>
 #include <xen/interface/physdev.h>

arch/x86/xen/mmu.c

@@ -41,7 +41,6 @@
 #include <linux/sched.h>
 #include <linux/highmem.h>
 #include <linux/bug.h>
-#include <linux/sched.h>
 
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>