src: add missing headers

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I6043ef792c2ce0a8e7584a73f83ca365ec61794d
diff --git a/src/PSUSensor.cpp b/src/PSUSensor.cpp
index 68c7a0e..a7b72a8 100644
--- a/src/PSUSensor.cpp
+++ b/src/PSUSensor.cpp
@@ -22,10 +22,13 @@
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/date_time/posix_time/posix_time.hpp>
 #include <iostream>
+#include <istream>
 #include <limits>
+#include <memory>
 #include <sdbusplus/asio/connection.hpp>
 #include <sdbusplus/asio/object_server.hpp>
 #include <string>
+#include <vector>
 
 static constexpr const char* sensorPathPrefix = "/xyz/openbmc_project/sensors/";