pinctrl: imx: Rename imx_pinctrl_remove() to imx_pinctrl_remove_mmio()

The current implementation of imx_pinctrl_remove() is specific
to the MMIO accessor implementation, rename the function to
imx_pinctrl_remove_mmio() to make this obvious. No functional
change.

Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/drivers/pinctrl/nxp/pinctrl-imx.c b/drivers/pinctrl/nxp/pinctrl-imx.c
index e65e069..26b990e 100644
--- a/drivers/pinctrl/nxp/pinctrl-imx.c
+++ b/drivers/pinctrl/nxp/pinctrl-imx.c
@@ -262,7 +262,7 @@
 	return 0;
 }
 
-int imx_pinctrl_remove(struct udevice *dev)
+int imx_pinctrl_remove_mmio(struct udevice *dev)
 {
 	struct imx_pinctrl_priv *priv = dev_get_priv(dev);
 	struct imx_pinctrl_soc_info *info = priv->info;