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

These structures are only stored in fields of a pinctrl_desc
structure (confops, pctlops, and pmxops) that are const. Make the
structures const as well.

Done with the help of Coccinelle.

Signed-off-by: Julia Lawall <[e-mail]>
Acked-by: Patrice Chotard <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/pinctrl-st.c

···
 {
 }
 
-static struct pinctrl_ops st_pctlops = {
+static const struct pinctrl_ops st_pctlops = {
 	.get_groups_count	= st_pctl_get_groups_count,
 	.get_group_pins		= st_pctl_get_group_pins,
 	.get_group_name		= st_pctl_get_group_name,
···
 	return 0;
 }
 
-static struct pinmux_ops st_pmxops = {
+static const struct pinmux_ops st_pmxops = {
 	.get_functions_count	= st_pmx_get_funcs_count,
 	.get_function_name	= st_pmx_get_fname,
 	.get_function_groups	= st_pmx_get_groups,
···
 		ST_PINCONF_UNPACK_RT_DELAY(config));
 }
 
-static struct pinconf_ops st_confops = {
+static const struct pinconf_ops st_confops = {
 	.pin_config_get		= st_pinconf_get,
 	.pin_config_set		= st_pinconf_set,
 	.pin_config_dbg_show	= st_pinconf_dbg_show,