Input: synaptics-rmi4 - use dev_driver_string when registering interrupt

When IRQ handling was moved to rmi_driver in 3aeed5b the naming of the
interrupt changed from "rmi4_i2c" to "2-0020" (or similar). This patch
restores the previous behaviour and makes the interrupt easier to identify
in /proc/interrupts.

Signed-off-by: Nick Dyer <nick@shmanahar.org>
Tested-by: Chris Healy <cphealy@gmail.com>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/rmi4/rmi_driver.c

@@ -251,7 +251,7 @@ static int rmi_irq_init(struct rmi_device *rmi_dev)
 
 	ret = devm_request_threaded_irq(&rmi_dev->dev, pdata->irq, NULL,
 					rmi_irq_fn, irq_flags | IRQF_ONESHOT,
-					dev_name(rmi_dev->xport->dev),
+					dev_driver_string(rmi_dev->xport->dev),
 					rmi_dev);
 	if (ret < 0) {
 		dev_err(&rmi_dev->dev, "Failed to register interrupt %d\n",