pinctrl: digicolor: add missing platform_set_drvdata() call

gc_pinctrl_remove() calls platform_get_drvdata(), but I see neither
platform_set_drvdata() nor dev_set_drvdata() anywhere in this driver.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-digicolor.c

@@ -332,6 +332,8 @@ static int dc_pinctrl_probe(struct platform_device *pdev)
 		return PTR_ERR(pmap->pctl);
 	}
 
+	platform_set_drvdata(pdev, pmap);
+
 	return dc_gpiochip_add(pmap, pdev->dev.of_node);
 }