kernel-docs from devel:ARM:15.4:Contrib:S32G2 project

需要 standard ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/devel:ARM:15.4:Contrib:S32G2/standard/devel:ARM:15.4:Contrib:S32G2.repo
zypper refresh
zypper install kernel-docs