More devicetree changes for omap variants

There's a patch for previously merged dts changes to remove the last
remaining use of legacy phy_id property.

For dra7, we have a non-urgent PCIe dts fix, enable a PCIe errata for
unaligned access.

For omap5, we enable omap5 USB OTG mode for DWC3 controller.

And we add support for am335x based Moxa UC-2100 series of industrial
computers.
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