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: I1a852c56534abd3a134867963948dbdb4b5ace41
Signed-off-by: Swetha Chikkaboraiah <schikk@codeaurora.org>
Signed-off-by: Chetan C R <cchinnad@codeaurora.org>