utility/sdbus: Add bus processing workaround

Provide a wrapper for others to use that works around a memory leak that
we have with processing dbus matches in an event loop.

Change-Id: I944e9c254784

utility/sdbus: Add bus processing workaround

Provide a wrapper for others to use that works around a memory leak that
we have with processing dbus matches in an event loop.

Change-Id: I944e9c2547844b507216e334bd013f26b8a547da
Signed-off-by: William A. Kennington III <wak@google.com>

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