arm64: dts: qcom: sm6125: Add IOMMU context to DWC3

Add an IOMMU context to the USB DWC3 controller, required to get USB
functionality upon enablement of apps_smmu.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Martin Botka <martin.botka@somainline.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221222193254.126925-5-marijn.suijten@somainline.org