dt-bindings: pinctrl: pinctrl-microchip-sgpio: Add reset binding

This describes the new binding which allows to call a reset driver from
the pinctrl-microchip-sgpio driver.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211018085754.1066056-2-horatiu.vultur@microchip.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>