Samsung PM updates for v3.19

- Refactor the pm code to use DT based lookup instead of
  using "soc_is_exynosxxxx"

- Firmware supporting suspend and resume to excute of low
  level operations to enter and leave power mode for exynos
  : introduce suspend() and resume() firmware operations

- Fix AFTR mode on boards with secure firmware enabled and
  allows exynos cpuidle driver usage on exynos4x12 SoCs

- Fix build with PM_SLEEP=n and ARM_EXYNOS_CPUIDLE=y

- SWRESET is needed to boot secondary CPU on exynos3250
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