Samsung updates for v4.2

- add failure(exception) handling
  : of_iomap(), of_find_device_by_node() and kstrdup()

- add common poweroff to use PS_HOLD based for all of exynos SoCs
- add exnos_get/set_boot_addr() helper
- constify platform_device_id and irq_domain_ops
- get current parent clock for power domain on/off
- use core_initcall to register power domain driver
- make exynos_core_restart() less verbose

- add support coupled CPUidle for exynos3250

- fix exynos_boot_secondary() return value on timeout
- fix clk_enable() in s3c24xx adc
- fix missing of_node_put() for power domains
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