pinctrl: msm: Add pinctrl driver and board support for msm8909

Add initial pinctrl driver to support pin configuration
with pinctrl framework for msm8909. While at it, add the
msm8909 board support as well.

Change-Id: Ia4d57385c70e7aadf10937f4fa5fdc86c7082622
Signed-off-by: Venkatesh Yadav Abbarapu <vabbar@codeaurora.org>