Power management-Idle State

[zephyrbot]

Reported by Robert Beatty:

The RTOS shall facilitate SoC level power management by providing callback hooks for application specific low power functionality when entering idle states.

(Imported from Jira ZEP-1943)

[zephyrbot]

by Robert Beatty:

"Legacy Requirement , already supported
Impact due to tickless timer
Details of power management flows needed to confirm the support"

[ramakrishnapallala]

Zephyr already support soc level idle and sleep states. This issue can be closed.
SYS_PM_ACTIVE_STATE
SYS_PM_LOW_POWER_STATE
SYS_PM_DEEP_SLEEP