MAINTAINERS: Add linux-kbuild's patchwork

Add patchwork URL for Kconfig and Kbuild.
Signed-off-by: Nicolas Schier <nicolas@fjasle.eu>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

MAINTAINERS

@@ -11035,6 +11035,7 @@ KCONFIG
 M:	Masahiro Yamada <masahiroy@kernel.org>
 L:	linux-kbuild@vger.kernel.org
 S:	Maintained
+Q:	https://patchwork.kernel.org/project/linux-kbuild/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git kconfig
 F:	Documentation/kbuild/kconfig*
 F:	scripts/Kconfig.include
@@ -11097,6 +11098,7 @@ R:	Nick Desaulniers <ndesaulniers@google.com>
 R:	Nicolas Schier <nicolas@fjasle.eu>
 L:	linux-kbuild@vger.kernel.org
 S:	Maintained
+Q:	https://patchwork.kernel.org/project/linux-kbuild/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git
 F:	Documentation/kbuild/
 F:	Makefile