Rework per-arch vmlinux solution
* have per-arch directory under sched/include/arch/, in which we
maintain vmlinux.h symlink and real file
vmlinux-{kernel_ver}-g{sha1}.h. The original sched/include/vmlinux/
folder is removed.
* update meson build `-I` option to find the new vmlinux.h position
* update cargo build scripts to use the per-arch vmlinux.h for
generating bindings
* keep the original ClangInfo refactoring changes
Signed-off-by: Ming Yang <minos.future@gmail.com>
