dt-bindings: gpio: Convert cirrus,clps711x-mctrl-gpio to DT schema

Convert the cirrus,clps711x-mctrl-gpio binding to DT schema format.
Add the missing "gpio,syscon-dev" phandle property.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250714202919.3012764-1-robh@kernel.org


Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>