dt-bindings: gpio: arm,pl061: Drop interrupt properties as required

dt-bindings: gpio: arm,pl061: Drop interrupt properties as required

It is possible that the PL061 doesn't have any interrupt connected and
can't be an interrupt provider, so drop the interrupt properties as
required.

The LG LG131x SoCs are one example of this.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250609220900.3035642-1-robh@kernel.org
[Bartosz: g/pl011/pl061/]
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>