drop unused header: handler_ipml

The ipmi routing handler only needs to know the interface, and not any
specific implementation.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Id76119ee644f719d18c24f1b97b69557bcceb8fa
diff --git a/ipmi.cpp b/ipmi.cpp
index 09f7df4..d297efc 100644
--- a/ipmi.cpp
+++ b/ipmi.cpp
@@ -21,7 +21,7 @@
 #include "cpld.hpp"
 #include "entity_name.hpp"
 #include "eth.hpp"
-#include "handler_impl.hpp"
+#include "handler.hpp"
 #include "pcie_i2c.hpp"
 #include "psu.hpp"