Revert removal of power hint from PowerManager.aidl

Reverts all changes on PowerManagerService.cpp and bring back power hint
methods and usages.

This cl stops using the new PowerHalController, to confirm it is the cause
of the perf regression from b/157483189. Once confirmed it can be
reintroduced later once the root cause is fixed within the new code.

Forrest run: https://android-build.googleplex.com/builds/forrest/run/L68600000629276407
android.platform.test.scenario.sysui.power.PowerMenuMicrobenchmark#testPower_verifySystemPowerMenuAppears
gfxinfo_com.android.systemui_jank_percentile_95-mean:12.28

Bug: b/157483189
Test: atest FrameworksServicesTests:PowerManagerServiceTest
Change-Id: Id087f6867174a15c74617f3bb1cccb3569a358ac