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

Change-Id: I2d41abae9cbf4878979966d5509f68e34dacdbba
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/src/inventory_mac.hpp b/src/inventory_mac.hpp
index f7aec32..72b312d 100644
--- a/src/inventory_mac.hpp
+++ b/src/inventory_mac.hpp
@@ -1,10 +1,6 @@
 #pragma once
 #include <memory>
-
-namespace sdbusplus::bus
-{
-class bus;
-}
+#include <sdbusplus/bus.hpp>
 
 namespace phosphor::network
 {
@@ -18,7 +14,7 @@
 {
     virtual ~Runtime() = default;
 };
-std::unique_ptr<Runtime> watch(sdbusplus::bus::bus& bus, Manager& m);
+std::unique_ptr<Runtime> watch(sdbusplus::bus_t& bus, Manager& m);
 
 } // namespace inventory
 } // namespace phosphor::network