test: Remove unneeded header

Signed-off-by: Willy Tu <wltu@google.com>
Change-Id: I1a6f6fdd4de59a8f6682a0c7609d380c4bc493e1
diff --git a/test/helper.cpp b/test/helper.cpp
index 73e19aa..0a67458 100644
--- a/test/helper.cpp
+++ b/test/helper.cpp
@@ -1,7 +1,5 @@
 #include "helper.hpp"
 
-#include "ipmi.hpp"
-
 #include <ipmid/api-types.hpp>
 #include <optional>
 #include <span>