Add deleted flag back into aconfig

Flag was deleted from code but is necessary for CTS. Also, create some organization in commonly used flag files to better keep track of what flags can/cannot be deleted since invalid deletions are not caught at build time

Test: NotificationManagerTest
Fixes: 415154531
Flag: EXEMPT flag cleanup
Change-Id: I7a97f563bf535f4e05b2133d4bde9b8008cba2e3