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-regulators/src/dbus_sensors.hpp b/phosphor-regulators/src/dbus_sensors.hpp
index 590c960..7a4d6ca 100644
--- a/phosphor-regulators/src/dbus_sensors.hpp
+++ b/phosphor-regulators/src/dbus_sensors.hpp
@@ -50,7 +50,7 @@
      *
      * @param bus D-Bus bus object
      */
-    explicit DBusSensors(sdbusplus::bus::bus& bus) :
+    explicit DBusSensors(sdbusplus::bus_t& bus) :
         bus{bus}, manager{bus, sensorsObjectPath}
     {}
 
@@ -81,7 +81,7 @@
     /**
      * D-Bus bus object.
      */
-    sdbusplus::bus::bus& bus;
+    sdbusplus::bus_t& bus;
 
     /**
      * D-Bus object manager.