ARM: dts: msm: Add IOMMU mapping to USB nodes

Add the IOMMU mapping to the primary and secondary USB nodes
along with their respective SIDs.

Also add the "linux,sysdev_is_parent" property to the child dwc3
node, which allows the child device to share the parent's device
when performing DMA operations.

Change-Id: I4dda53237a6365763b770a0a22084e261e252c51
Signed-off-by: Jack Pham <jackp@codeaurora.org>