Consistently use CPU uptime for temporary allowlist

The handler message to evaluate the timeout is delayed based on CPU
uptime. The calculation of the time throughout activity manager should
just use the same clock for ending the temporary allowlist for each app.

Flag: com.android.server.deviceidle.use_cpu_time_for_temp_allowlist

Test: atest FrameworksMockingServicesTests:DeviceIdleControllerTest
Test: Manually inspect dumps

BYPASS_INCLUSIVE_LANGUAGE_REASON=Existing APIs

Bug: 376561328
Change-Id: I8c256e0a5536fe8278b1021f389d7ee37b88e22c