MAINTAINERS: kbuild: Add pattern for scripts/*vmlinux*

scripts/link-vmlinux.sh is part of kbuild so extend the pattern to match
any vmlinux related scripts.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>