Turn CONFIG_CRYPTO_USER_API* into modules

Timothée Ravierrequested to merge
Siosm/kernel-ark:os-build-crypto-api-modules into os-build

Move support for the kernel cryptographic API userspace interface to a module, which will enable systems that don't make use of it to not load the modules.

The main known user of this interface is iwd: https://archive.kernel.org/oldwiki/iwd.wiki.kernel.org/

See: https://lwn.net/Articles/1070454/

See: https://news.ycombinator.com/item?id=47956312

Edited by Timothée Ravier

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