pinctrl: renesas: rza1: Make mux_conf const in rza1_pin_mux_single()

The rza1_mux_conf object pointed to by the mux_conf parameter of
rza1_pin_mux_single() is never modified.  Make it const.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://patch.msgid.link/168e06bc57081aa3c42ff9aa2740a0a108df7d34.1761033950.git.geert+renesas@glider.be

Author: geertu

drivers/pinctrl/renesas/pinctrl-rza1.c

@@ -668,7 +668,7 @@ static inline int rza1_pin_get(struct rza1_port *port, unsigned int pin)
  * @mux_conf: pin multiplexing descriptor
  */
 static int rza1_pin_mux_single(struct rza1_pinctrl *rza1_pctl,
-			       struct rza1_mux_conf *mux_conf)
+			       const struct rza1_mux_conf *mux_conf)
 {
 	struct rza1_port *port = &rza1_pctl->ports[mux_conf->port];
 	unsigned int pin = mux_conf->pin;
@@ -1118,7 +1118,7 @@ static int rza1_set_mux(struct pinctrl_dev *pctldev, unsigned int selector,
 			   unsigned int group)
 {
 	struct rza1_pinctrl *rza1_pctl = pinctrl_dev_get_drvdata(pctldev);
-	struct rza1_mux_conf *mux_confs;
+	const struct rza1_mux_conf *mux_confs;
 	const struct function_desc *func;
 	struct group_desc *grp;
 	int i;
@@ -1131,7 +1131,7 @@ static int rza1_set_mux(struct pinctrl_dev *pctldev, unsigned int selector,
 	if (!func)
 		return -EINVAL;
 
-	mux_confs = (struct rza1_mux_conf *)func->data;
+	mux_confs = (const struct rza1_mux_conf *)func->data;
 	for (i = 0; i < grp->grp.npins; ++i) {
 		int ret;