arm64: dts: qcom: sm8550: Mark UFS controller as cache coherent

The UFS controller on SM8550 supports cache coherency, hence add the
"dma-coherent" property to mark it as such.

Fixes: 35cf1aaa

 ("arm64: dts: qcom: sm8550: Add UFS host controller and phy nodes")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230308054630.7202-1-manivannan.sadhasivam@linaro.org