src: add missing headers

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I6043ef792c2ce0a8e7584a73f83ca365ec61794d
diff --git a/src/IpmbSensor.cpp b/src/IpmbSensor.cpp
index 459599d..d9a4e25 100644
--- a/src/IpmbSensor.cpp
+++ b/src/IpmbSensor.cpp
@@ -24,12 +24,19 @@
 #include <boost/algorithm/string.hpp>
 #include <boost/algorithm/string/predicate.hpp>
 #include <boost/algorithm/string/replace.hpp>
+#include <boost/container/flat_map.hpp>
 #include <chrono>
+#include <functional>
 #include <iostream>
 #include <limits>
+#include <memory>
 #include <numeric>
 #include <sdbusplus/asio/connection.hpp>
 #include <sdbusplus/asio/object_server.hpp>
+#include <sdbusplus/bus/match.hpp>
+#include <string>
+#include <tuple>
+#include <variant>
 #include <vector>
 
 constexpr const bool debug = false;