drm/tilcdc: use pm_runtime_irq_safe()

tilcdc calls runtime PM get/put functions everywhere. Some of those
places will be called in irq context, crashing the driver.

As a quick fix, use pm_runtime_irq_safe() for tilcdc.

Signed-off-by: Tomi Valkeinen <[e-mail]>
Signed-off-by: Jyri Sarha <[e-mail]>

drivers/gpu/drm/tilcdc/tilcdc_drv.c

···
 	DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
 
 	pm_runtime_enable(dev->dev);
+	pm_runtime_irq_safe(dev->dev);
 
 	/* Determine LCD IP Version */
 	pm_runtime_get_sync(dev->dev);