drivers: soc: qcom: snapshot of sleep drivers for Lahaina

This is a snapshot of the Sleep driver and related functionality as of
'commit b252df6e0200 ("cpuidle: lpm-levels: log enabled regulators
before entering suspend")' on msm-4.19 branch.

Updates:
        - Remove event timers
        - Remove per-cpu PM QoS
        - Remove rpm stats (Use new soc_sleep_stats driver instead)
        - Update __arch_counter_get_cntvct (new)
        - Update to get next wakeup from cpuidle device
	- Remove pending_ipi and is_IPI_pending() (defined in smp.c)
	- Update copyright
	- Update Kconfig menu items
	- Update hotplug enum to use the already upstreamed
	- ifdef's around scheduler functions that are not upstreamed

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