Revert "Add a check for apex/allowed_deps.txt to droidcore."

Revert "Track allowed transitive deps in any updatable module."

Revert submission 1312796-apex-allowed-deps

Reason for revert: b/161974327
Reverted Changes:
I52a4be72e:Add a check for apex/allowed_deps.txt to droidcore...
I56771ba3f:Track allowed transitive deps in any updatable mod...

Change-Id: I20ad7bf2001e76b5e3ca4aaf3baa5318e270f3dc