kexec: Minor enhancement to includes in crash.c

linux/uaccess.h was being included, but it seems that 
really the following includes are needed.

asm/page.h: for __va() and PAGE_SHIFT
asm/uaccess.h: for copy_to_user()

I guess that linux/uaccess.h pulls in both asm/page.h and
asm/uaccess.h.
I notices this while backporting the code to xen's
linux-2.6.16.33,
which does not have linux/uaccess.h. I'm posting it as I
think it is a
correct, though somewhat cosmetic fix.

Signed-off-by: Simon Horman <hormsverge.net.au>

Index: linux-2.6/arch/ia64/kernel/crash_dump.c
============================================================
=======
--- linux-2.6.orig/arch/ia64/kernel/crash_dump.c	2006-12-20
10:49:17.000000000 +0900
+++ linux-2.6/arch/ia64/kernel/crash_dump.c	2006-12-20
10:49:20.000000000 +0900
 -9,7
+9,8 
 #include <linux/errno.h>
 #include <linux/types.h>
 
-#include <linux/uaccess.h>
+#include <asm/page.h>
+#include <asm/uaccess.h>
 
 /**
  * copy_oldmem_page - copy one page from
"oldmem"
-
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