test/crypto: fix AESNI-MB CPU tests

test/crypto: fix AESNI-MB CPU tests

The AESNI-MB CPU test cases, which are executed via the
cryptodev_cpu_aesni_mb_autotest command, aborted when it tried to run
the DOCSIS security tests as these are not CPU type tests. The abort
happened at the following line in process_crypto_request():

RTE_VERIFY(gbl_action_type != RTE_SECURITY_ACTION_TYPE_CPU_CRYPTO);

The tests have been updated not to run the DOCSIS (or PDCP) security
tests during cryptodev_cpu_aesni_mb_autotest, with the decision based on
improved PMD security capability checks.

Fixes: ea31f2b4f547 ("test/crypto: add DOCSIS security cases")
Signed-off-by: David Coyle <david.coyle@intel.com>
Acked-by: Akhil Goyal <akhil.goyal@nxp.com>
Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>