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: I29672cb229bd07022b00f52105ac1d50ecacca62
diff --git a/nmi_main.cpp b/nmi_main.cpp
index 36a0004..ccf7d3c 100644
--- a/nmi_main.cpp
+++ b/nmi_main.cpp
@@ -30,7 +30,7 @@
     pdbg_targets_init(NULL);
 
     // Add sdbusplus ObjectManager
-    sdbusplus::server::manager::manager objManager(bus, BUSPATH_NMI);
+    sdbusplus::server::manager_t objManager(bus, BUSPATH_NMI);
     openpower::proc::NMI NMI(bus, BUSPATH_NMI);
     bus.request_name(BUSNAME_NMI);