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_sequencer_monitor.hpp b/phosphor-power-sequencer/src/power_sequencer_monitor.hpp
index eb151ce..ed095bb 100644
--- a/phosphor-power-sequencer/src/power_sequencer_monitor.hpp
+++ b/phosphor-power-sequencer/src/power_sequencer_monitor.hpp
@@ -26,7 +26,7 @@
      * Create a base device object for power sequence monitoring.
      * @param bus D-Bus bus object
      */
-    explicit PowerSequencerMonitor(sdbusplus::bus::bus& bus);
+    explicit PowerSequencerMonitor(sdbusplus::bus_t& bus);
 
     /**
      * Logs an error using the D-Bus Create method.
@@ -50,7 +50,7 @@
     /**
      * The D-Bus bus object
      */
-    sdbusplus::bus::bus& bus;
+    sdbusplus::bus_t& bus;
 
     /*
      * Create a BMC Dump