ARM: SoC fixes for 3.18-rc6

A collection of fixes this week:

- A set of clock fixes for shmobile platforms
- A fix for tegra that moves serial port labels to be per board.
  We're choosing to merge this for 3.18 because the labels will start
  being parsed in 3.19, and without this change serial port numbers that
  used to be stable since the dawn of time will change numbers.
- A few other DT tweaks for Tegra.
- A fix for multi_v7_defconfig that makes it stop spewing cpufreq errors on
  Arndale (Exynos).
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