pinctrl: msm: Add support for MSM TLMM pinmux

Add a new device tree enabled pinctrl driver for
Qualcomm MSM SoC's. This driver provides an extensible
framework to interface all MSM's that use a TLMM pinmux,
with the pinctrl subsytem.

This driver is split into two parts: the pinctrl interface
and the TLMM version specific implementation. The pinctrl
interface parses the device tree and registers with the pinctrl
subsytem. The TLMM version specific implementation supports
pin configuration/register programming for the different
pin types present on a given TLMM pinmux version.

Add support only for TLMM version 3 pinmux right now,
as well as, only two of the different pin types present on the
TLMM v3 pinmux.
Pintype 1: General purpose pins.
Pintype 2: SDC pins.

Change-Id: I065d874cd2c6fd002d5b3cb4b355445bb6912bf4
Signed-off-by: Hanumant Singh <hanumant@codeaurora.org>