dt-bindings: gpio: brcmstb: permit gpio-line-names property

dt-bindings: gpio: brcmstb: permit gpio-line-names property

gpio-line-names is a generic property that can be supported by any
GPIO controller, so permit it through the binding.

It is permitted to have a variable number of GPIOs per node based
on brcm,gpio-bank-widths, so define an arbitrary maximum number of
items based on current users.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20241212-dt-bcm2712-fixes-v3-3-44a7f3390331@raspberrypi.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>