pinctrl: qcom: Add sdm660 pinctrl driver

Add initial pinctrl driver to support pin
configuration with pinctrl framework for sdm660.
This is a snapshot of driver file as of msm-4.4
commit 674d6a5ef1729c0b7("pinctrl: qcom: Add
UFS_RESET pin data for sdm660").

Change-Id: I36420ea230cf621f88c24690c1d705244ad1c495
Signed-off-by: Naitik Bharadiya <bharad@codeaurora.org>