[IA64] kexec: remove unnecessary #ifdef CONFIG_XEN.

There is no specific reason to reduce memory and stack registers
for kexec. So remove those #ifdef CONFIG_XEN.

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>

diff -r 043b7e98c473 arch/ia64/kernel/relocate_kernel.S
--- a/arch/ia64/kernel/relocate_kernel.S	Thu Jul 24 14:31:27 2008 +0900
+++ b/arch/ia64/kernel/relocate_kernel.S	Thu Jul 24 14:31:46 2008 +0900
@@ -187,18 +187,10 @@
 
 .align  32
 memory_stack:
-#ifdef CONFIG_XEN
-	.fill           4096, 1, 0
-#else
 	.fill           8192, 1, 0
-#endif
 memory_stack_end:
 register_stack:
-#ifdef CONFIG_XEN
-	.fill           4096, 1, 0
-#else
 	.fill           8192, 1, 0
-#endif
 register_stack_end:
 relocate_new_kernel_end:
 END(relocate_new_kernel)