crypto/aesni_gcm: fix performance on some AVX512 CPUs
crypto/aesni_gcm: fix performance on some AVX512 CPUs

This patch fixes the aesni_gcm performance issue on systems with AVX512
CPU flag presented but with VAES CPU flag missing, such as Skylake.

Fixes: 81fe96a0cece ("crypto/aesni_gcm: use architecture independent API")
Cc: stable@dpdk.org

Signed-off-by: Kai Ji <e209f74ea3428a187ef98c7554e3872af2c59055@intel.com>
Acked-by: Fan Zhang <b46d470dc79aa6fd718cd24d07380f6203b7fc3c@intel.com>

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