Revert "Create exported mode flag library for package android.os"

This reverts commit 3256901e595140e3e4a714846bace53367bdde15.

Reason for revert: Likely culprit for b/327606846. Will be running through ABTD for confirmation and before submitting the revert. 

Change-Id: I7332c0350413f9a2552df92ca2d5f7f4eb2bb2b3
2 files changed