From: Javier Martinez Canillas on
gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1533#note_1146...
@thuth it's true that s390x is normally headless and I considered keeping it
as a module (and also for ppc64le) but then decided to just have it built-in
everywhere to simplify the config since as @Conan_Kudo explained we need DRM
to be built-in for simpledrm.
But I can change and have it as a module in those platforms if you prefer
that.