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_sensor.cpp b/phosphor-regulators/src/dbus_sensor.cpp
index 1dfd172..31932b2 100644
--- a/phosphor-regulators/src/dbus_sensor.cpp
+++ b/phosphor-regulators/src/dbus_sensor.cpp
@@ -66,7 +66,7 @@
 constexpr double voltageHysteresis = 0.001;
 constexpr const char* voltageNamespace = "voltage";
 
-DBusSensor::DBusSensor(sdbusplus::bus::bus& bus, const std::string& name,
+DBusSensor::DBusSensor(sdbusplus::bus_t& bus, const std::string& name,
                        SensorType type, double value, const std::string& rail,
                        const std::string& deviceInventoryPath,
                        const std::string& chassisInventoryPath) :