pinctrl: qcom: Add msm8226 pinctrl driver.

Add initial Qualcomm msm8226 pinctrl driver to support pin configuration
with pinctrl framework for msm8226 SoC.

- Initial formatting and style was taken from the msm8x74 pinctrl driver
  added by Björn Andersson <bjorn.andersson@linaro.org>

Signed-off-by: Bartosz Dudziak <bartosz.dudziak@snejp.pl>
Link: https://lore.kernel.org/r/20200716205530.22910-3-bartosz.dudziak@snejp.pl


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