pinctrl: qcom: Add msm8916 pinctrl driver

Add initial pinctrl driver to support pin configuration with
pinctrl framework for msm8916.

Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>