Remove CFI diagnostics mode

CFI diagnostics sould be disabled since it introduces additional
overhead/complexity, and the diagnostics libraries haven't been analyzed
from a security perspective since they were primarily meant for testing.
The CFI will still work.

Bug: 146408702
Bug: 149427927
Merged-In: I4403da7c2b893907ca48918142c98bb6211656e6
Change-Id: I4879e51c9b7f0252d78bd0aa0faa66a38d52262b
(cherry picked from commit b95b20b9a3f94ae7583ef41e5fed7220e96aa2cc)
5 files changed