sdbusplus: use shorter type aliases

The sdbusplus headers provide shortened aliases for many types.
Switch to using them to provide better code clarity and shorter
lines.  Possible replacements are for:
  * bus_t
  * exception_t
  * manager_t
  * match_t
  * message_t
  * object_t
  * slot_t

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I9541d521bf67882215a4a66dce020e38ac2df065
diff --git a/occ_manager.hpp b/occ_manager.hpp
index d0b01b3..a713507 100644
--- a/occ_manager.hpp
+++ b/occ_manager.hpp
@@ -171,7 +171,7 @@
      *
      *  @returns 0 to indicate success
      */
-    int cpuCreated(sdbusplus::message::message& msg);
+    int cpuCreated(sdbusplus::message_t& msg);
 
     /** @brief Create child OCC objects.
      *
@@ -427,7 +427,7 @@
      *
      *  @param[in]  msg - Data associated with subscribed signal
      */
-    void ambientCallback(sdbusplus::message::message& msg);
+    void ambientCallback(sdbusplus::message_t& msg);
 
     /** @brief Confirm that a single OCC master was found and start presence
      * monitoring