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: Ibc88a5de1e7a11d332410985f29698b24aeae983
diff --git a/src/mdrv2_main.cpp b/src/mdrv2_main.cpp
index 2699571..7ab907a 100644
--- a/src/mdrv2_main.cpp
+++ b/src/mdrv2_main.cpp
@@ -33,9 +33,9 @@
 
 int main(void)
 {
-    sdbusplus::bus::bus& bus = static_cast<sdbusplus::bus::bus&>(*connection);
-    sdbusplus::server::manager::manager objManager(
-        bus, "/xyz/openbmc_project/inventory");
+    sdbusplus::bus_t& bus = static_cast<sdbusplus::bus_t&>(*connection);
+    sdbusplus::server::manager_t objManager(bus,
+                                            "/xyz/openbmc_project/inventory");
 
     bus.request_name("xyz.openbmc_project.Smbios.MDR_V2");