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-3.18 kernel version @commit 9bbf4c38e5b9e8
("soc: qcom: bgrsb: Increase time out for RSB channel opening")

Change-Id: I2d81dbb81efdc9593cdfcca8f56806acdb210b81
Signed-off-by: Raja Mallik <rmallik@codeaurora.org>
Signed-off-by: Chinkit Kumar,Kirti Kumar Parmar <parma@codeaurora.org>
Signed-off-by: Sundara Vinayagam <sundvi@codeaurora.org>