dt-bindings: pinctrl: sx150xq: allow gpio line naming

dt-bindings: pinctrl: sx150xq: allow gpio line naming

Adding gpio-line-names property works fine for this
device node, but dtb check drops warning:

'gpio-line-names' does not match any of the regexes: '-cfg$', 'pinctrl-[0-9]+'
from schema $id: http://devicetree.org/schemas/pinctrl/semtech,sx1501q.yaml#

Allow to add property gpio-line-names for this devices.

Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/20241105064206.43626-3-hs@denx.de
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>