arm64: dts: qcom: sc8180x: drop duplicated PCI iommus property

The IOMMUs for PCI controller on SC8180x are defined in iommu-map, so
drop duplicared iommus:

  sc8180x-lenovo-flex-5g.dtb: pci@1c08000: Unevaluated properties are not allowed ('iommus' was unexpected)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231112184430.3495-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>