pinctrl: ingenic: make function ingenic_pinctrl_probe static

The function ingenic_pinctrl_probe is local to the source and does
not need to be in global scope, so make it static.

Cleans up sparse warnings
symbol 'ingenic_pinctrl_probe' was not declared. Should it be static?
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-ingenic.c

@@ -717,7 +717,7 @@ static const struct of_device_id ingenic_pinctrl_of_match[] = {
 	{},
 };
 
-int ingenic_pinctrl_probe(struct platform_device *pdev)
+static int ingenic_pinctrl_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct ingenic_pinctrl *jzpc;