pinctrl: renesas: Remove sh_pfc_config_mux_for_gpio()

This function is now replaced by common pin controller GPIO configuration
functionality, drop it.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Alex Kiernan <alex.kiernan@gmail.com>
Cc: Christoph Muellner <christoph.muellner@theobroma-systems.com>
Cc: Eugeniu Rosca <roscaeugeniu@gmail.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick DELAUNAY <patrick.delaunay@st.com>
Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Cc: Simon Glass <sjg@chromium.org>
diff --git a/drivers/pinctrl/renesas/pfc.c b/drivers/pinctrl/renesas/pfc.c
index 52c486e..d1271da 100644
--- a/drivers/pinctrl/renesas/pfc.c
+++ b/drivers/pinctrl/renesas/pfc.c
@@ -524,11 +524,6 @@
 	return 0;
 }
 
-int sh_pfc_config_mux_for_gpio(struct udevice *dev, unsigned pin_selector)
-{
-	return sh_pfc_gpio_request_enable(dev, pin_selector);
-}
-
 static int sh_pfc_pinctrl_pin_set(struct udevice *dev, unsigned pin_selector,
 				  unsigned func_selector)
 {
diff --git a/drivers/pinctrl/renesas/sh_pfc.h b/drivers/pinctrl/renesas/sh_pfc.h
index 09e11d3..6629e1f 100644
--- a/drivers/pinctrl/renesas/sh_pfc.h
+++ b/drivers/pinctrl/renesas/sh_pfc.h
@@ -275,7 +275,6 @@
 const struct pinmux_bias_reg *
 sh_pfc_pin_to_bias_reg(const struct sh_pfc *pfc, unsigned int pin,
 		       unsigned int *bit);
-int sh_pfc_config_mux_for_gpio(struct udevice *dev, unsigned pin_selector);
 
 extern const struct sh_pfc_soc_info r8a7790_pinmux_info;
 extern const struct sh_pfc_soc_info r8a7791_pinmux_info;