dt-bindings: pinctrl: aspeed: Add missing properties to examples

The aspeed pinctrl parent node (SCU) in the examples is missing various
properties. Add the properties in preparation for the SCU schema.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220810161635.73936-2-robh@kernel.org


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