Revert "Kill process if it's cached & idle and in forced-app-standby mode"

This reverts commit 6cf25139.

Reason for revert: It results in thrashing the system in some cases

Bug: 192082833
Bug: 152573287
Test: atest FrameworksMockingServicesTests
Test: atest FrameworksServicesTests
Change-Id: I0ca09655b7911857cded5da74169b0c3bd332bda