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/ucd90320_monitor.cpp b/phosphor-power-sequencer/src/ucd90320_monitor.cpp
index 050fcdc..297d20b 100644
--- a/phosphor-power-sequencer/src/ucd90320_monitor.cpp
+++ b/phosphor-power-sequencer/src/ucd90320_monitor.cpp
@@ -47,7 +47,7 @@
 
 namespace device_error = sdbusplus::xyz::openbmc_project::Common::Device::Error;
 
-UCD90320Monitor::UCD90320Monitor(sdbusplus::bus::bus& bus, std::uint8_t i2cBus,
+UCD90320Monitor::UCD90320Monitor(sdbusplus::bus_t& bus, std::uint8_t i2cBus,
                                  std::uint16_t i2cAddress) :
     PowerSequencerMonitor(bus),
     match{bus,
@@ -132,7 +132,7 @@
     }
 }
 
-void UCD90320Monitor::interfacesAddedHandler(sdbusplus::message::message& msg)
+void UCD90320Monitor::interfacesAddedHandler(sdbusplus::message_t& msg)
 {
     // Only continue if message is valid and rails / pins have not already been
     // found