Revert "PackageParser support for flagging manifest entries"

This reverts commit 1d71aa6f.

Reason for revert: Likely culprit for b/342000526  - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: Iff38c55a7ec68786107c305129ab091b2384b36b