Remove obsolete support for emulated FBE

Emulated FBE was a developer-mode feature intended to allow developers
to add Direct Boot support to apps before native FBE devices became
widely available.  Since all devices running the latest version of
Android now use native FBE (except for a couple edge cases not relevant
here, like in-development devices on which encryption hasn't been
enabled yet), and emulated FBE doesn't work on native FBE devices
anyway, there's no longer any need to carry the code for emulated FBE.

Bug: 232458753
Change-Id: I2ab35472c872b19b2bf64aa99424b5ccd9f6170f