ARM: dts: msm: Enable SMMU stage 1 bypass mode with USB on SDM845

This change reverts commit ("95d8216e ARM: dts: msm: Remove USB
IOMMU mapping on SDM845") which allows USB to use SMMU with stage 1
bypass mode as all pre-required configuration are available now. It
also updates iommu-cell property as it needs 2 values now.

Change-Id: If90128894bd6da62b324afa0577dec75bece3c6c
Signed-off-by: Mayank Rana <mrana@codeaurora.org>