Exynos mutiplatform support for 3.16

Here is enabling the exynos platform as part of a multiplatform
kernel. This is including ARCH_EXYNOS related Kconfig entries
consolidation. And fixes exynos-cpufreq driver compilation with
ARCH_MULTIPLATFORM.

Note that this is based on tags/exynos-soc. And tags/samsung-dt,
tags/samsung-clk are merged on top of that.
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