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_control.cpp b/phosphor-power-sequencer/src/power_control.cpp
index 91021a4..e120532 100644
--- a/phosphor-power-sequencer/src/power_control.cpp
+++ b/phosphor-power-sequencer/src/power_control.cpp
@@ -40,7 +40,7 @@
 const std::string busPropertyName = "Bus";
 const std::string namePropertyName = "Name";
 
-PowerControl::PowerControl(sdbusplus::bus::bus& bus,
+PowerControl::PowerControl(sdbusplus::bus_t& bus,
                            const sdeventplus::Event& event) :
     PowerObject{bus, POWER_OBJ_PATH, PowerObject::action::defer_emit},
     bus{bus}, device{std::make_unique<PowerSequencerMonitor>(bus)},
@@ -116,7 +116,7 @@
     return state;
 }
 
-void PowerControl::interfacesAddedHandler(sdbusplus::message::message& msg)
+void PowerControl::interfacesAddedHandler(sdbusplus::message_t& msg)
 {
     // Only continue if message is valid and device has not already been found
     if (!msg || deviceFound)