Revert "Support Speck encryption."

This is a partial revert of
commit 6a0fa62dc71157f85b24ed15e39ada277f9b5201.

Remove the Speck encryption support. It was eventually
decided not to allow Speck in Android P, so this code
is no longer needed and wasn't used outside of testing.

We retain the e4crypt_get_policy_flags() changes from original
commit, though.

Bug: 112009351
Test: Confirmed AES continues to work with FBE.
Change-Id: I53b091dd4c5392de7a00a8c168919fb55e527eaf
1 file changed