rpm/group-source-files.pl: Add arch/*/tools/* files to the devel package
    
    Commit b71c9ffb1405 ("powerpc: Add arch/powerpc/tools directory")
    introduced in v4.12-rc1 release, moved the scripts into the tools
    directory. However, this location is not considered for the kernel devel
    package and the following error occurs when building a kmp for powerpc
    
    make[2]: /usr/src/linux-4.12.9-1/arch/powerpc/tools/gcc-check-mprofile-kernel.sh: Command not found