Initial pinctrl driver to support pin configuration framework for msm8909.

Snapshot is taken from msm-3.18 kernel version @ commit bf9148fb
("ARM: dts: msm: disable internal pull up for 8909w BG")

Change-Id: I6dae758e699ef410470eafddf317a630a05f9308
Signed-off-by: Sundara Vinayagam <sundvi@codeaurora.org>