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_interface.cpp b/nmi_interface.cpp
index a0cafc0..c8f507b 100644
--- a/nmi_interface.cpp
+++ b/nmi_interface.cpp
@@ -31,7 +31,7 @@
 namespace proc
 {
 
-NMI::NMI(sdbusplus::bus::bus& bus, const char* path) :
+NMI::NMI(sdbusplus::bus_t& bus, const char* path) :
     Interface(bus, path), bus(bus), objectPath(path)
 {}