Remove unused FDE methods from StorageManager

Now that FDE is no longer supported, remove the FDE-related methods from
StorageManager that are no longer called.

Bug: 208476087
Change-Id: Ic24a5b029bdf51dec622d1b70cef9ef26c3d54c5
(cherry picked from commit 41fa601601ecb094fd813ac4c01356045c34cf88)
Merged-In: Ic24a5b029bdf51dec622d1b70cef9ef26c3d54c5
5 files changed