s390/headers: replace __s390x__ with CONFIG_64BIT where possible

Replace __s390x__ with CONFIG_64BIT in all places that are not exported
to userspace or guarded with #ifdef __KERNEL__.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/lib/uaccess_std.c b/arch/s390/lib/uaccess_std.c
index bb1a7ee..57e9429 100644
--- a/arch/s390/lib/uaccess_std.c
+++ b/arch/s390/lib/uaccess_std.c
@@ -15,7 +15,7 @@
 #include <asm/futex.h>
 #include "uaccess.h"
 
-#ifndef __s390x__
+#ifndef CONFIG_64BIT
 #define AHI	"ahi"
 #define ALR	"alr"
 #define CLR	"clr"