crypto: xilinx/zynqmp-sha - remove unnecessary alignmask

The zynqmp-sha3-384 algorithm sets a nonzero alignmask, but it doesn't
appear to actually need it.  Therefore, stop setting it.  This will
allow this algorithm to keep being registered after alignmask support is
removed from shash.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>