dt-bindings: pinctrl: samsung: Add missing constraint for Exynos8895 interrupts

Expect only one interrupt on Exynos8895 wake-up pin controller.

Fixes: e2d58d1e ("dt-bindings: pinctrl: samsung: add exynos8895-wakeup-eint compatible")
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20241015065848.29429-2-krzysztof.kozlowski@linaro.org


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>