softirq/s390: Use the generic local_softirq_pending()

Defined local_softirq_pending_ref macro and get rid of {local, set, or}
_softirq_pending macros. use {local, set, or}_softirq_pending
in <linux/interrupt.h> that rely on per-CPU mutators.

Signed-off-by: Yejune Deng <yejunedeng@gmail.com>

arch/s390/include/asm/hardirq.h

@@ -13,9 +13,7 @@
 
 #include <asm/lowcore.h>
 
-#define local_softirq_pending() (S390_lowcore.softirq_pending)
-#define set_softirq_pending(x) (S390_lowcore.softirq_pending = (x))
-#define or_softirq_pending(x)  (S390_lowcore.softirq_pending |= (x))
+#define local_softirq_pending_ref  S390_lowcore.softirq_pending
 
 #define __ARCH_IRQ_STAT
 #define __ARCH_IRQ_EXIT_IRQS_DISABLED