ARM: SoC platform updates for v4.1

Our SoC branch usually contains expanded support for new SoCs and other core
platform code. In this case, that includes:

- Support for the new Annapurna Labs "Alpine" platform
- A rework greatly simplifying adding new platform support to the MCPM
  subsystem (Multi-cluster power management)
- Cpuidle and PM improvements for Exynos3250
- Misc updates for Renesas, OMAP, Meson, i.MX. Some of these could have
  gone in other branches but ended up here for various reasons.
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