ARM: dts: imxrt1170-pinfunc: Add pinctrl binding header

Add binding header for i.MXRT1170 pinctrl device tree.

Cc: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220723160513.271692-11-Mr.Bossman075@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>