powerpc/powernv/cpuidle: Back-end cpuidle driver for powernv platform.

Following patch ports the cpuidle framework for powernv
platform and also implements a cpuidle back-end powernv
idle driver calling on to power7_nap and snooze idle states.

Signed-off-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --cc arch/powerpc/platforms/powernv/setup.c
Simple merge

diff --cc drivers/cpuidle/Kconfig.powerpc
Simple merge

diff --cc drivers/cpuidle/Makefile
Simple merge

diff --cc drivers/cpuidle/cpuidle-powernv.c
Simple merge