x86: Set serial port IRQ for SMSC LPC47M

For starting a Linux console on the superio serial port under
interrupt mode, the IRQ number must be configured.

Signed-off-by: Jian Luo <jian.luo4@boschrexroth.de>
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/misc/smsc_lpc47m.c b/drivers/misc/smsc_lpc47m.c
index d51f8e3..1e50d5b 100644
--- a/drivers/misc/smsc_lpc47m.c
+++ b/drivers/misc/smsc_lpc47m.c
@@ -22,12 +22,13 @@
 	outb(0xaa, port);
 }
 
-void lpc47m_enable_serial(u16 dev, u16 iobase)
+void lpc47m_enable_serial(u16 dev, u16 iobase, u8 irq)
 {
 	pnp_enter_conf_state(dev);
 	pnp_set_logical_device(dev);
 	pnp_set_enable(dev, 0);
 	pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
+	pnp_set_irq(dev, PNP_IDX_IRQ0, irq);
 	pnp_set_enable(dev, 1);
 	pnp_exit_conf_state(dev);
 }