Disintegrate asm/system.h for X86

Disintegrate asm/system.h for X86.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
cc: x86@kernel.org
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 292da13..61270e8 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -40,7 +40,6 @@
 #include <linux/cpuidle.h>
 
 #include <asm/pgtable.h>
-#include <asm/system.h>
 #include <asm/processor.h>
 #include <asm/i387.h>
 #include <asm/fpu-internal.h>
@@ -53,6 +52,7 @@
 #include <asm/syscalls.h>
 #include <asm/debugreg.h>
 #include <asm/nmi.h>
+#include <asm/switch_to.h>
 
 asmlinkage extern void ret_from_fork(void);