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/presence_service.hpp b/phosphor-regulators/src/presence_service.hpp
index 83b73c1..9520dbd 100644
--- a/phosphor-regulators/src/presence_service.hpp
+++ b/phosphor-regulators/src/presence_service.hpp
@@ -83,7 +83,7 @@
      *
      * @param bus D-Bus bus object
      */
-    explicit DBusPresenceService(sdbusplus::bus::bus& bus) : bus{bus}
+    explicit DBusPresenceService(sdbusplus::bus_t& bus) : bus{bus}
     {}
 
     /** @copydoc PresenceService::clearCache() */
@@ -102,12 +102,12 @@
      *
      * @return true if exception type is expected, false otherwise
      */
-    bool isExpectedException(const sdbusplus::exception::exception& e);
+    bool isExpectedException(const sdbusplus::exception_t& e);
 
     /**
      * D-Bus bus object.
      */
-    sdbusplus::bus::bus& bus;
+    sdbusplus::bus_t& bus;
 
     /**
      * Cached presence data.