cleanup sdbus CAMELCASE define

The transition from 45a1ed71bc3743a6107c94e25275e21fdbefa90e is
complete so clean up the old defines.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I54ba6d2f1e29a036aa3e2680327517c24d958c41
diff --git a/chassis_state_manager.hpp b/chassis_state_manager.hpp
index 9b13af4..6518ea0 100644
--- a/chassis_state_manager.hpp
+++ b/chassis_state_manager.hpp
@@ -15,10 +15,6 @@
 #include <experimental/filesystem>
 #include <functional>
 
-#ifndef SDBUSPP_NEW_CAMELCASE
-#define pohCounter pOHCounter
-#endif
-
 namespace phosphor
 {
 namespace state