Add initial Qualcomm SDX55 pinctrl driver to support pin configuration
with pinctrl framework for SDX55 SoC.

[ported from downstream and tidy up]
Signed-off-by: NJeevan Shriram <jshriram@codeaurora.org>
Signed-off-by: NVinod Koul <vkoul@kernel.org>
Reviewed-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: NManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20201109062620.14566-3-vkoul@kernel.orgSigned-off-by: NLinus Walleij <linus.walleij@linaro.org>