No need to remove NT during CPU setup

head.S already clears EFLAGS completely. Following an i386 patch from 
Zachary Amsden.

Signed-off-by: Andi Kleen <ak@suse.de>

Index: linux/arch/x86_64/kernel/setup64.c
===================================================================
--- linux.orig/arch/x86_64/kernel/setup64.c
+++ linux/arch/x86_64/kernel/setup64.c
@@ -223,13 +223,6 @@ void __cpuinit cpu_init (void)
 	asm volatile("lidt %0" :: "m" (idt_descr));
 
 	memcpy(me->thread.tls_array, cpu_gdt_table[cpu], GDT_ENTRY_TLS_ENTRIES * 8);
-
-	/*
-	 * Delete NT
-	 */
-
-	asm volatile("pushfq ; popq %%rax ; btr $14,%%rax ; pushq %%rax ; popfq" ::: "eax");
-
 	syscall_init();
 
 	wrmsrl(MSR_FS_BASE, 0);