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: I8e2242adb79be342562c9b7f3d2153dfdf578085
diff --git a/oem/ibm/test/libpldmresponder_oem_platform_test.cpp b/oem/ibm/test/libpldmresponder_oem_platform_test.cpp
index e9d02aa..5ad4fe2 100644
--- a/oem/ibm/test/libpldmresponder_oem_platform_test.cpp
+++ b/oem/ibm/test/libpldmresponder_oem_platform_test.cpp
@@ -53,7 +53,7 @@
     uint16_t entityInstance_ = 0;
     uint8_t compSensorCnt_ = 1;
     uint16_t effecterId = 0xA;
-    sdbusplus::bus::bus bus(sdbusplus::bus::new_default());
+    sdbusplus::bus_t bus(sdbusplus::bus::new_default());
     Requester requester(bus, "/abc/def");
     auto event = sdeventplus::Event::get_default();
     std::vector<get_sensor_state_field> stateField;
@@ -186,7 +186,7 @@
 TEST(generateStateEffecterOEMPDR, testGoodRequest)
 {
     auto inPDRRepo = pldm_pdr_init();
-    sdbusplus::bus::bus bus(sdbusplus::bus::new_default());
+    sdbusplus::bus_t bus(sdbusplus::bus::new_default());
     Requester requester(bus, "/abc/def");
     auto mockDbusHandler = std::make_unique<MockdBusHandler>();
     auto event = sdeventplus::Event::get_default();
@@ -291,7 +291,7 @@
 TEST(generateStateSensorOEMPDR, testGoodRequest)
 {
     auto inPDRRepo = pldm_pdr_init();
-    sdbusplus::bus::bus bus(sdbusplus::bus::new_default());
+    sdbusplus::bus_t bus(sdbusplus::bus::new_default());
     Requester requester(bus, "/abc/def");
 
     auto mockDbusHandler = std::make_unique<MockdBusHandler>();