drivers: soc: qcom: snapshot of idle/sleep driver as of msm-4.14

This is a snapshot of the Sleep driver and related functionality as of
'commit 290ff60ecf130 ("cpuidle: Fix cpu requent exits from low power
mode")' on msm-4.14 branch.

Port sleep drivers and related functionality for Kona:
	- Kernel API change: tick_nohz_get_sleep_length.
	- Kernel API change: lpm_cpuidle_select.
	- Remove API custer_notify in drivers/cpuidle/lpm_levels.c.
	- Update system_pm to use the new RPMH driver API.

Fix checkpatch errors:
	- Update bool in MSM_PM drivers/soc/qcom/Kconfig.
	- Use %pK instead of %p in drivers/soc/qcom/event_timer.c.
	- Add SPDX-License-Identifier tag and remove description.
	- Refactor lpm-levels-of.c to avoid coccci errors.
	- Refactor for CCN compliance.

Following patches are dropped:
	- commit '8f5cb16ccb161 ("drivers: cpuidle: lpm-levels: plug in
	  cpu bias")'
	- commit '2d6d73f17e6a0 ("lpm-levels: Select lpm for isolated cpu
	  when sleep is disabled")'
	- commit '5a38caa6a9562 ("drivers: cpuidle: lpm-levels: Ignore
	  sleep bias for isolated cpus")'
	- commit '218dc74604b11 ("cpuidle: lpm-levels: Do not predict LPM
	  for isolated cpus")'

Change-Id: I75336ec927932d93c0c193a20973fc84e3b05ff5
Signed-off-by: Arjun Bagla <arbagla@codeaurora.org>
Signed-off-by: Lina Iyer <ilina@codeaurora.org>