pinctrl: bcm281xx: constify pinconf_ops, pinctrl_ops, and pinmux_ops structures

This pinconf_ops structure is only stored in the const confops
field of a pinctrl_desc structure. Make the pinconf_ops structure
const as well.

Done with the help of Coccinelle.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/bcm/pinctrl-bcm281xx.c

@@ -1384,7 +1384,7 @@ static int bcm281xx_pinctrl_pin_config_set(struct pinctrl_dev *pctldev,
 	return 0;
 }
 
-static struct pinconf_ops bcm281xx_pinctrl_pinconf_ops = {
+static const struct pinconf_ops bcm281xx_pinctrl_pinconf_ops = {
 	.pin_config_get = bcm281xx_pinctrl_pin_config_get,
 	.pin_config_set = bcm281xx_pinctrl_pin_config_set,
 };