dt-bindings: gpio: brcmstb: add gpio-ranges

Add optional gpio-ranges device-tree property to the Broadcom
Set-Top-Box GPIO controller.

Signed-off-by: Doug Berger <opendmb@gmail.com>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240424185039.1707812-2-opendmb@gmail.com


Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>