crypto/aesni_mb: fix DOCSIS AES-256
crypto/aesni_mb: fix DOCSIS AES-256

When adding support for DOCSIS AES-256,
when setting the cipher parameters, all key sizes
were accepted, but only 128-bit and 256-bit keys
are supported.

Fixes: 9536622b86c8 ("crypto/aesni_mb: support DOCSIS AES-256")

Signed-off-by: Pablo de Lara <28355d9cfe41bb8148aea0fb24f47aae8f4217a1@intel.com>
Acked-by: Mairtin o Loingsigh <4eed1ef30a742dc5d2a9504c925d501d68698605@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk