Add initial pinctrl driver to support pin configuration with
pinctrl framework for msm8996.

Cc: <devicetree@vger.kernel.org>
Signed-off-by: NJoonwoo Park <joonwoop@codeaurora.org>
[sboyd@codeaurora.org: Remove duplicate entries and enums]
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>
Acked-by: NRob Herring <robh@kernel.org>
Acked-by: NBjörn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>