pinctrl: samsung: Staticize drvdata_list

'drvdata_list' is used only in this file. Make it static.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-samsung.c

@@ -50,7 +50,7 @@ static struct pin_config {
 };
 
 /* Global list of devices (struct samsung_pinctrl_drv_data) */
-LIST_HEAD(drvdata_list);
+static LIST_HEAD(drvdata_list);
 
 static unsigned int pin_base;