fix IWYU issue for sdbusplus/bus/match.hpp

clang-tidy explicitly includes sdbusplus/bus/match.hpp even though its
already available through sdbusplus/async/match.hpp, so use IWYU pragma
to mark sdbusplus/async/match.hpp as exporter of sdbusplus/bus/match.hpp
as per [1].

[1]: https://github.com/include-what-you-use/include-what-you-use/blob/master/docs/IWYUPragmas.md#iwyu-pragma-export

Change-Id: I5df39ee642b476aa502fc0707db241eb42378577
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>
diff --git a/include/sdbusplus/async/match.hpp b/include/sdbusplus/async/match.hpp
index 10f9fe7..4dbc61a 100644
--- a/include/sdbusplus/async/match.hpp
+++ b/include/sdbusplus/async/match.hpp
@@ -1,7 +1,7 @@
 #pragma once
 #include <sdbusplus/async/context.hpp>
 #include <sdbusplus/async/execution.hpp>
-#include <sdbusplus/bus/match.hpp>
+#include <sdbusplus/bus/match.hpp> // IWYU pragma: export
 #include <sdbusplus/message.hpp>
 #include <sdbusplus/slot.hpp>