ARM: dts: msm: Add missing properties of USB for SDM670

This change updates the USB regulators as per sdm670
power grid, adds correct SID for LPASS ADSP USB audio stream
and deletes the iommu property which is not required for
SDM670.

Change-Id: Ice7d5cba7a1716d6e8ab870689019682f9c7d651
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>