pinctrl: max77620: Remove unused structure definition

The strucuture 'max77620_cfg_param' is defined but never used by the
max77620 driver. Remove this structure definition.

Signed-off-by: Jon Hunter <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/pinctrl-max77620.c

···
 	int mux_option;
 };
 
-struct max77620_cfg_param {
-	const char *property;
-	enum max77620_pinconf_param param;
-};
-
 static const struct pinconf_generic_params max77620_cfg_params[] = {
 	{
 		.property = "maxim,active-fps-source",