clocksource/drivers/h8300_timer8: Fix compilation error with dev_warn

The dev_warn is using the platform driver which was removed in the previous
patch.

Let's replace dev_warn by pr_warn.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/clocksource/h8300_timer8.c

@@ -98,7 +98,7 @@ static void timer8_set_next(struct timer8_priv *p, unsigned long delta)
 
 	raw_spin_lock_irqsave(&p->lock, flags);
 	if (delta >= 0x10000)
-		dev_warn(&p->pdev->dev, "delta out of range\n");
+		pr_warn("delta out of range\n");
 	now = timer8_get_counter(p);
 	p->tcora = delta;
 	ctrl_outb(ctrl_inb(p->mapbase + _8TCR) | 0x40, p->mapbase + _8TCR);