crypto-perf image fails on kernels with CVE-2020-12888

[mythi]

See:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=abafbc551fddede3e0a08dee1dcde08fc0eb8476
https://lore.kernel.org/kvm/159310421505.27590.16617666489295503039.stgit@gimli.home/

[mythi]

this is fixed in DPDK 19.11.4 and we have .5, so closing.