dt-bindings: pinctrl: qcom,sc7280-pinctrl: add gpio-line-names

Add common gpio-line-names property (used on SC7280 Herobrine boards).

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220912061746.6311-26-krzysztof.kozlowski@linaro.org


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>