Ignore shouldNotFreeze when CPU_TIME flag is on

When cpu_time is used to decide freezability, we need to ignore
shouldNotFreeze that is continued to be computed for audit and logging
purposes.

Test: atest FrameworksMockingServicesTests:CachedAppOptimizerTest

Flag: com.android.server.am.cpu_time_capability_based_freeze_policy

Bug: 440461047
Change-Id: Iec7a14e92d1a15b609c3327214dacb1e930f132a