kbuild: Fix inconsistent comment

The commit 2042b5486bd3 ("kbuild: unset variables in top Makefile
instead of setting 0") renamed the variable from "config-targets"
to "config-build", the comment should be consistent accordingly.

Signed-off-by: Kaiden PK Yu (余泊鎧) <KaidenPK.Yu@moxa.com>
Signed-off-by: SZ Lin (林上智) <sz.lin@moxa.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
diff --git a/Makefile b/Makefile
index 86035d8..c9199ca 100644
--- a/Makefile
+++ b/Makefile
@@ -1804,7 +1804,7 @@
 
 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
 
-endif # config-targets
+endif # config-build
 endif # mixed-build
 endif # need-sub-make