edtlib: pinctrl properties are required in the binding

Consumers need to include `pinctrl-device.yaml` where this is defined.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

scripts/dts/python-devicetree/src/devicetree/edtlib.py

@@ -1551,7 +1551,6 @@ def _check_undeclared_props(self) -> None:
             # Allow a few special properties to not be declared in the binding
             if prop_name.endswith("-controller") or \
                prop_name.startswith("#") or \
-               prop_name.startswith("pinctrl-") or \
                prop_name in {
                    "compatible", "status", "ranges", "phandle",
                    "interrupt-parent", "interrupts-extended", "device_type"}: