Revert "BACKPORT, FROMLIST: fscrypt: add Speck128/256 support"

This reverts commit 4b08356a.

Resolves conflicts with a later CL, e7724207 "fscrypt: log the
crypto algorithm implementations".

[astrachan: This is an update to 076c36fc which reverted only
            the fscrypt changes, not the ext4 changes, due to a
            historical bad merge.]
Bug: 116008047
Change-Id: I772d78d6e4bd126dcd2b25049c719f8522a1c157
Signed-off-by: Alistair Strachan <astrachan@google.com>