MAINTAINERS: Add Nathan and Nicolas to Kbuild reviewers

As suggested by Nick, add Nathan and myself to Kbuild reviewers to share more
review responsibilities.
Signed-off-by: Nicolas Schier <nicolas@fjasle.eu>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

MAINTAINERS

@@ -11093,7 +11093,9 @@ F:	fs/autofs/
 KERNEL BUILD + files below scripts/ (unless maintained elsewhere)
 M:	Masahiro Yamada <masahiroy@kernel.org>
 M:	Michal Marek <michal.lkml@markovi.net>
+R:	Nathan Chancellor <nathan@kernel.org>
 R:	Nick Desaulniers <ndesaulniers@google.com>
+R:	Nicolas Schier <nicolas@fjasle.eu>
 L:	linux-kbuild@vger.kernel.org
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git