Revert "crypto: testmgr - Add multibuffer hash testing"

This reverts commit 8b54e6a8.

The multibuffer tests has a number of bugs.  For example, the SG
lists for the filler requests weren't initialised properly, and
it fails to take data-keyed algorithms such as poly1305 into account.

More importantly, the chaining interface itself is under review.
Revert this until the interface is fully settled.

Reported-by: Manorit Chawdhry <m-chawdhry@ti.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202503281658.7a078821-lkp@intel.com


Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>