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: I223d58649a21565678bd7ef78d955b30d3fd6d84
diff --git a/manager/led-main.cpp b/manager/led-main.cpp
index a6f8f82..86c13f5 100644
--- a/manager/led-main.cpp
+++ b/manager/led-main.cpp
@@ -45,7 +45,7 @@
     phosphor::led::Manager manager(bus, systemLedMap);
 
     /** @brief sd_bus object manager */
-    sdbusplus::server::manager::manager objManager(bus, OBJPATH);
+    sdbusplus::server::manager_t objManager(bus, OBJPATH);
 
     /** @brief vector of led groups */
     std::vector<std::unique_ptr<phosphor::led::Group>> groups;