cpuidle: lpm-levels: Enable LPM support for non psci target

Add non psci legacy lpm support. Modify and align changes
for clock event, MPM and cpu hotplug for LPM callback notification.

Remove deprecated scheduler c-state(idle cpu), d-state(idle cluster)
setting from lpm driver.

Snapshot is taken from msm-4.9 kernel version @commit b9ad452666da39.
("soc: qcom: bgrsb: Increase time out for RSB channel opening").

Change-Id: I8958ab4f098cc6d875071e3f100b8b74845e0cfa
Signed-off-by: Haribabu Gattem <haribabu@codeaurora.org>
Signed-off-by: Suresh Kumar Allam <allamsuresh@codeaurora.org>