ARM64: SoC changes for 3.18

Starting with 3.18, we are merging SoC-specific changes for arm64 through
the arm-soc tree, like we have been doing for arm32.

This time, there is only one set of changes, adding support for the
Cavium "Thunder" Soc family. Since the changes are relatively small,
this includes Kconfig, defconfig and DT changes.

If all goes well, we will never require adding actual C source code
for platform support in arm64, given that the architecture is more
clearly defined and we have moved out a lot of the platform specifics
into device drivers for arm32 already.
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