attn: Remove dbus method wrapper extended support

The attention handler dbus method wrapper function allowed for
specifying an extended function parameter for things like get property.
This is no longer being used and was removed.

Signed-off-by: Ben Tyner <ben.tyner@ibm.com>
Change-Id: I16ed0af65093cbaa577e4a72dee45e441efff104
diff --git a/attn/attn_dbus.hpp b/attn/attn_dbus.hpp
index 59291a7..2d72740 100644
--- a/attn/attn_dbus.hpp
+++ b/attn/attn_dbus.hpp
@@ -18,14 +18,12 @@
  * @param i_interface - dbus method interface
  * @param i_function - dbus interface function
  * @param o_method - method that is created
- * @param i_extended - optional for extended methods
  * @return non-zero if error
  *
  **/
 int dbusMethod(const std::string& i_path, const std::string& i_interface,
                const std::string& i_function,
-               sdbusplus::message::message& o_method,
-               const std::string& i_extended = "");
+               sdbusplus::message::message& o_method);
 
 /**
  * Create a PEL for the specified event type