pinctrl: zynq: add static to platform_driver remove callback

This function is only referenced in this file.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Sören Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-zynq.c

@@ -1205,7 +1205,7 @@ static int zynq_pinctrl_probe(struct platform_device *pdev)
 	return 0;
 }
 
-int zynq_pinctrl_remove(struct platform_device *pdev)
+static int zynq_pinctrl_remove(struct platform_device *pdev)
 {
 	struct zynq_pinctrl *pctrl = platform_get_drvdata(pdev);