lib/crypto: tests: Add additional SHAKE tests

lib/crypto: tests: Add additional SHAKE tests

Add the following test cases to cover gaps in the SHAKE testing:

    - test_shake_all_lens_up_to_4096()
    - test_shake_multiple_squeezes()
    - test_shake_with_guarded_bufs()

Remove test_shake256_tiling() and test_shake256_tiling2() since they are
superseded by test_shake_multiple_squeezes().  It provides better test
coverage by using randomized testing.  E.g., it's able to generate a
zero-length squeeze followed by a nonzero-length squeeze, which the
first 7 versions of the SHA-3 patchset handled incorrectly.

Tested-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20251026055032.1413733-7-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>