Add support for the GPIO controller in the pm6350 PMIC.
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Link: https://lore.kernel.org/r/20211007212444.328034-6-luca@z3ntu.xyzSigned-off-by: Linus Walleij <linus.walleij@linaro.org>