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-supply/test/mock.hpp b/phosphor-power-supply/test/mock.hpp
index 13d22e6..d964964 100644
--- a/phosphor-power-supply/test/mock.hpp
+++ b/phosphor-power-supply/test/mock.hpp
@@ -48,18 +48,18 @@
     virtual ~MockedUtil() = default;
 
     MOCK_METHOD(bool, getPresence,
-                (sdbusplus::bus::bus & bus, const std::string& invpath),
+                (sdbusplus::bus_t & bus, const std::string& invpath),
                 (const, override));
     MOCK_METHOD(void, setPresence,
-                (sdbusplus::bus::bus & bus, const std::string& invpath,
+                (sdbusplus::bus_t & bus, const std::string& invpath,
                  bool present, const std::string& name),
                 (const, override));
     MOCK_METHOD(void, setAvailable,
-                (sdbusplus::bus::bus & bus, const std::string& invpath,
+                (sdbusplus::bus_t & bus, const std::string& invpath,
                  bool available),
                 (const, override));
     MOCK_METHOD(void, handleChassisHealthRollup,
-                (sdbusplus::bus::bus & bus, const std::string& invpath,
+                (sdbusplus::bus_t & bus, const std::string& invpath,
                  bool addRollup),
                 (const, override));
 };