dt-bindings: pinctrl: qcom,sa8775p-tlmm: add missing wakeup-parent

dt-bindings: pinctrl: qcom,sa8775p-tlmm: add missing wakeup-parent

Add missing wakeup-parent property, already used by DTS to indicate that
pins are wakeup capable:

  sa8775p-ride.dtb: pinctrl@f000000: 'wakeup-parent' does not match any of the regexes: '-state$', 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20231018145750.429385-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>