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

Fixes: a89441fc ("arm64: dts: qcom: sm8250: add apps_smmu node")
Fixes: 04a3605b ("arm64: dts: qcom: add sm8250 GPU nodes")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230704-topic-8250_pcie_dmac-v1-2-799603a980b0@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>