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: I17807e986cefa6a3d9e757c533ac373035438aed
diff --git a/include/rde/external_storer_file.hpp b/include/rde/external_storer_file.hpp
index f6a6281..bb853f4 100644
--- a/include/rde/external_storer_file.hpp
+++ b/include/rde/external_storer_file.hpp
@@ -83,13 +83,13 @@
      * will take the ownership of this object.
      */
     ExternalStorerFileInterface(
-        sdbusplus::bus::bus& bus, std::string_view rootPath,
+        sdbusplus::bus_t& bus, std::string_view rootPath,
         std::unique_ptr<FileHandlerInterface> fileHandler);
 
     bool publishJson(std::string_view jsonStr) override;
 
   private:
-    sdbusplus::bus::bus& bus;
+    sdbusplus::bus_t& bus;
     std::string rootPath;
     std::unique_ptr<FileHandlerInterface> fileHandler;
     std::string logServiceId;