Move tag definitions into policy

Currently, the tags are defined in system/core.
Instead, reserve a range in system/core and define the tags in policy.

Next, we add a flag for interceptKeyBeforeQueueing.

Bug: 128933363
Test: adb logcat -b events, turn on screen, then press power button and
observe the logs.

Change-Id: I1fde2a2e7451ec67987ad3b09abc28be64410427