The PCIe hosts on SM8250 are cache-coherent. Mark them as such.

Fixes: e53bdfc0 ("arm64: dts: qcom: sm8250: Add PCIe support")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230704-topic-8250_pcie_dmac-v1-1-799603a980b0@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>