Revert the removal of FBE related checks.

These were removed as there was no public/system APIs for these.
But for backward compatibility we still need a solution. Instead
of coming up with a solution in R, will do it in S since we can
continue using hidden APIs in R.

Test: basic sanity
Bug: 144368037
Change-Id: Id8f30b18cc0ba95834c0cc5a4b98c96ddf49803e