arm64: dts: qcom: sc8180x-flex-5g: use 'gpios' suffix for PCI GPIOs

arm64: dts: qcom: sc8180x-flex-5g: use 'gpios' suffix for PCI GPIOs

Linux handles both versions, but bindings expect GPIO properties to
have 'gpios' suffix instead of 'gpio':

  sc8180x-lenovo-flex-5g.dtb: pci@1c08000: Unevaluated properties are not allowed ('perst-gpio', 'wake-gpio' were unexpected)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20231111164229.63803-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>