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: Ib9045e9c30db1586eb9463358323924e0f213a6d
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/fw-update/update.hpp b/fw-update/update.hpp
index 307b702..c6cfccc 100644
--- a/fw-update/update.hpp
+++ b/fw-update/update.hpp
@@ -30,7 +30,7 @@
      *  @param[in] objPath - D-Bus object path
      *  @param[in] updateManager - Reference to FW update manager
      */
-    Update(sdbusplus::bus::bus& bus, const std::string& path,
+    Update(sdbusplus::bus_t& bus, const std::string& path,
            UpdateManager* updateManager) :
         UpdateIntf(bus, path.c_str()), updateManager(updateManager),
         objPath(path)