Clean up VDM flags launched in Android 15.

 - dynamic_policy
 - cross_device_clipboard
 - persistent_device_id_api
 - virtual_stylus
 - device_aware_record_audio_permission (not used as API flag)

None of these have ever been used with @RequiresFlagsDisabled
in CTS, no no CPs are needed.

#codehealth

Bug: 359515249
Bug: 379646558
Fix: 299275907
Test: presubmit
Flag: EXEMPT cleanup
Change-Id: I1fef0873393653bce84f868efa53c33af73339fb