serial: sh-sci: suspend/resume wakeup support V2

This patch adds wakeup support to the sh-sci driver. The serial
core deals with all details but defaults to wakeup disabled. So
to make use of this feature enable wakeup in sysfs:

echo enabled > /sys/class/tty/ttySC0/power/wakeup
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

drivers/tty/serial/sh-sci.c

@@ -1790,7 +1790,7 @@ static int __devinit sci_init_single(struct platform_device *dev,
 	 *
 	 * For the muxed case there's nothing more to do.
 	 */
-	port->irq		= p->irqs[SCIx_TXI_IRQ];
+	port->irq		= p->irqs[SCIx_RXI_IRQ];
 
 	if (p->dma_dev)
 		dev_dbg(port->dev, "DMA device %p, tx %d, rx %d\n",