ARM: SoC DT updates for 3.19, part 2

This is a follow-up to the early ARM SoC DT changes, with additional
content that has external dependencies:

* The Tegra IOMMU DT support depends on changes from the iommu
  tree, plus the contents of the arm-soc drivers branch
* The MVEBU PHY support depends on changes from the phy tree
* The AT91 DT support depends on changes from the RTC and
  DMA-slave trees

All of these changes just enable additional devices for
existing platforms.
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