pinctrl: spmi-gpio: Add support for PM2250

PM2250, commonly combined with QCM2290, provides ten SPMI GPIOs.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Link: https://lore.kernel.org/r/1637076915-3280-1-git-send-email-loic.poulain@linaro.org


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>