pinctrl: mvebu: silence WARN to dev_warn

Pinctrl will WARN on missing DT resources, which is a little bit too
noisy. Use dev_warn with FW_BUG instead.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/mvebu/pinctrl-dove.c

@@ -832,7 +832,8 @@ static int dove_pinctrl_probe(struct platform_device *pdev)
 	}
 
 	/* Warn on any missing DT resource */
-	WARN(fb_res.start, FW_BUG "Missing pinctrl regs in DTB. Please update your firmware.\n");
+	if (fb_res.start)
+		dev_warn(&pdev->dev, FW_BUG "Missing pinctrl regs in DTB. Please update your firmware.\n");
 
 	return mvebu_pinctrl_probe(pdev);
 }