Only include ipmid/api.hpp for the new API

After some feedback from users of the new IPMI API, they wanted to see
two things:
 1) don't require ipmid/api.hpp and ipmid/registration.hpp to be able to
    write new handlers
 2) only require including ipmid/api.hpp (instead of ipmid/api.h)

So now, by simply including ipmid/api.hpp instead of ipmid/api.h
(deprecated), handlers incorporating the new IPMI API can be written.

Change-Id: I446dcce70cff03d4ecc28c658292d052485f77fc
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
diff --git a/transporthandler.cpp b/transporthandler.cpp
index ba0772b..59d933a 100644
--- a/transporthandler.cpp
+++ b/transporthandler.cpp
@@ -4,11 +4,11 @@
 #include "user_channel/channel_layer.hpp"
 
 #include <arpa/inet.h>
-#include <ipmid/api.h>
 
 #include <chrono>
 #include <filesystem>
 #include <fstream>
+#include <ipmid/api.hpp>
 #include <ipmid/utils.hpp>
 #include <phosphor-logging/elog-errors.hpp>
 #include <phosphor-logging/log.hpp>