pinctrl: pxa: export pxa2xx_pinctrl_init()

Building pinctrl-pxa27x.c as a module causes a link error:

ERROR: "pxa2xx_pinctrl_init" [drivers/pinctrl/pxa/pinctrl-pxa27x.ko] undefined!
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pxa/pinctrl-pxa2xx.c

@@ -426,6 +426,7 @@ int pxa2xx_pinctrl_init(struct platform_device *pdev,
 
 	return 0;
 }
+EXPORT_SYMBOL(pxa2xx_pinctrl_init);
 
 int pxa2xx_pinctrl_exit(struct platform_device *pdev)
 {