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: Ief05bd757cffb1453e058a719ee4b060861752e7
diff --git a/tools/power-utils/updater.hpp b/tools/power-utils/updater.hpp
index fae9d24..458f651 100644
--- a/tools/power-utils/updater.hpp
+++ b/tools/power-utils/updater.hpp
@@ -95,7 +95,7 @@
 
   private:
     /** @brief The sdbusplus DBus bus connection */
-    sdbusplus::bus::bus bus;
+    sdbusplus::bus_t bus;
 
     /** @brief The PSU inventory path */
     std::string psuInventoryPath;