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/phosphor-power-sequencer/src/power_interface.hpp b/phosphor-power-sequencer/src/power_interface.hpp
index e4bf8cd..6b07d41 100644
--- a/phosphor-power-sequencer/src/power_interface.hpp
+++ b/phosphor-power-sequencer/src/power_interface.hpp
@@ -30,7 +30,7 @@
      * @param bus D-Bus bus object
      * @param path D-Bus object path
      */
-    PowerInterface(sdbusplus::bus::bus& bus, const char* path);
+    PowerInterface(sdbusplus::bus_t& bus, const char* path);
 
     /**
      * Emit the power good signal