remove unused asio/sd_event.hpp include

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I0ffa523edc51b244a0b1daa5314c9158bb7bd5a1
diff --git a/cold-redundancy/cold_redundancy.cpp b/cold-redundancy/cold_redundancy.cpp
index 8414923..d13b330 100644
--- a/cold-redundancy/cold_redundancy.cpp
+++ b/cold-redundancy/cold_redundancy.cpp
@@ -24,7 +24,6 @@
 #include <phosphor-logging/elog-errors.hpp>
 #include <sdbusplus/asio/connection.hpp>
 #include <sdbusplus/asio/object_server.hpp>
-#include <sdbusplus/asio/sd_event.hpp>
 #include <sdbusplus/bus/match.hpp>
 
 #include <array>