Revert "crypto: xts - Add ECB dependency"

This reverts commit 6145171a.

The commit fixes a bug that was only introduced in 4.10, thus is
irrelevant for <=4.9.

Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>