Stub out some FDE methods in StorageManager

Now that FDE is no longer supported, stub out some methods in
StorageManager that return FDE state.  This allows
StorageManager.getPasswordType() to be removed, and it prepares for
removing these methods later.

Bug: 208476087
Change-Id: Ib5bcfb6a0279150fec33f2c3edd0431b450c90f4
(cherry picked from commit 401bf8a176492297a695596c0df6aa3fb2a82d5e)
Merged-In: Ib5bcfb6a0279150fec33f2c3edd0431b450c90f4
1 file changed