arm64: dts: rockchip: drop redundant pcie-reset-suspend in Scarlet Dumo

There is no "pcie-reset-suspend" property in the PCI bindings or Linux
driver, so assume this was copied from downstream.  Drop the property,
but leave the comment, because it might be useful for someone.

This fixes dtbs_check warning:

  rk3399-gru-scarlet-dumo.dtb: pcie@f8000000: Unevaluated properties are not allowed ('pcie-reset-suspend' was unexpected)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240407102854.38672-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>