NOUPSTREAM: ANDROID: cpuidle: CPU Idle related vendor hooks

An event that gather the idle state that the cpu attempted to enter and
actually entered is added. Through this, the idle statistics of the cpu
can be obtained and used for vendor specific algorithms or for system
analysis.

[CPNOTE: 27/05/21] Lee: Vendor related code - maintain forever

Squash
  NOUPSTREAM: ANDROID: cpuidle-psci: Add vendor hook for cpuidle psci enter and exit

Bug: 162980647
Bug: 176198732
Bug: 183690687
Bug: 192436062
Bug: 195914333
Bug: 190353898

Change-Id: I9c2491d524722042e881864488f7b3cf7e903d1e
Signed-off-by: Park Bumgyu <bumgyu.park@samsung.com>
Signed-off-by: Lee Jones <joneslee@google.com>