main/kmod: remove kmod-static-nodes init.d service

The kmod-static-nodes init.d service only creates a file in the /run/tmpfiles.d/ directory. However tmpfiles.d functionality is a SystemD feature and the OpenRC compatible equivalent opentmpfiles https://github.com/OpenRC/opentmpfiles is retired/no longer supported and is not packaged for Alpine.

As there is no mechanism in Alpine to handle tmpfiles it therefore makes no sense for kmod to have a init.d service/kmod-openrc subpackage simply for creating a tmpfile that is never used.