Merge branch 'for-next/cpuidle' of git://git.kernel.org/pub/scm/linux/kernel/git...

These are the specific changes for ARM64 to make it possible to integrate the
DT based generic cpuidle driver in this tree.

It contains:
  * The documentation for the DT definitions for ARM
  * The refactoring of the cpu_suspend function for ARM64
  * Introduce the cpu_idle_init function for ARM64
  * Add the PSCI CPU SUSPEND based on the previous changes on cpu_suspend

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>