pinctrl: meson: remove unused pin_base

While removing the need to have pin_base defined in meson pinctrl
drivers, I forgot to remove the corresponding field from the
pinctrl_data structure.

Fixing this now.

Fixes: 70e5ecb1 ("pinctrl: meson: get rid of pin_base")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/meson/pinctrl-meson.h

@@ -103,7 +103,6 @@ struct meson_pinctrl_data {
 	const struct pinctrl_pin_desc *pins;
 	struct meson_pmx_group *groups;
 	struct meson_pmx_func *funcs;
-	unsigned int pin_base;
 	unsigned int num_pins;
 	unsigned int num_groups;
 	unsigned int num_funcs;