pinctrl: sunxi: depend on RESET_CONTROLLER

The A31 R_PIO driver depends on the reset framework in a mandatory way. Express
this by adding a depends on the reset framework in Kconfig

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>