pinctrl: qcom: Add sdm660 pinctrl DT drivers

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

Change-Id: Ibf20a28061ea60f4e73ccff94a63749666fd01b5
Signed-off-by: Swetha Chikkaboraiah <schikk@codeaurora.org>
Signed-off-by: Chetan C R <cchinnad@codeaurora.org>