config/arm: make N2 crypto an optional feature
config/arm: make N2 crypto an optional feature

Not all Neoverse-N2 CPUs must support the crypto feature/extension
which makes it an optional feature.
Only enable the feature for SoCs which support it.

Signed-off-by: Juraj Linkeš <cc98fdfd74a97bdc42df592c19d962e48c451a95@pantheon.tech>

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