arm64: dts: qcom: sdm845: add UFS controller

Add the UFS controller and PHY to SDM845.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
[bjorn: Add iommu context for the host controller]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Signed-off-by: Andy Gross <andy.gross@linaro.org>