[S390] 3270: add support for irq statistics

Add support for 3270 I/O interrupt statistics in /proc/interrupts.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/include/asm/irq.h b/arch/s390/include/asm/irq.h
index d52533d..65e63c0 100644
--- a/arch/s390/include/asm/irq.h
+++ b/arch/s390/include/asm/irq.h
@@ -19,6 +19,7 @@
 	IOINT_QDI,
 	IOINT_DAS,
 	IOINT_C15,
+	IOINT_C70,
 	NMI_NMI,
 	NR_IRQS,
 };