The GPIOAO bank is range from GPIOAO_0 to GPIOAO_13.

Fixes: 83c56680 ("pinctrl: meson-axg: Add new pinctrl driver for Meson AXG SoC")
Reported-by: NXingyu Chen <xingyu.chen@amlogic.com>
Signed-off-by: NYixun Lan <yixun.lan@amlogic.com>
Acked-by: NKevin Hilman <khilman@baylibre.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>