[S390] lcs: add support for irq statistics

Add support for LCS 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 6c9b556..6a455b8 100644
--- a/arch/s390/include/asm/irq.h
+++ b/arch/s390/include/asm/irq.h
@@ -22,6 +22,7 @@
 	IOINT_C70,
 	IOINT_TAP,
 	IOINT_VMR,
+	IOINT_LCS,
 	NMI_NMI,
 	NR_IRQS,
 };