kernel-source: Remove config-options.changes (jsc#PED-5021)
    
    The file doc/config-options.changes was used in the past to document
    kernel config changes. It was introduced in 2010 but haven't received
    any updates on any branch since 2015. The file is renamed by tar-up.sh
    to config-options.changes.txt and shipped in the kernel-source RPM
    package under /usr/share/doc. As its content now only contains outdated
    information, retaining it can lead to confusion for users encountering
    this file.
    
    Config changes are nowadays described in associated Git commit messages,
    which get automatically collected and are incorporated into changelogs
    of kernel RPM packages.
    
    Drop then this obsolete file, starting with its packaging logic.
    
    For branch maintainers: Upon merging this commit on your branch, please
    correspondingly delete the file doc/config-options.changes.