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: I96286490697ce5d7fecc1c9c358f5f1d054137ec
diff --git a/usb/usb_manager.cpp b/usb/usb_manager.cpp
index 2bab2de..196ab42 100644
--- a/usb/usb_manager.cpp
+++ b/usb/usb_manager.cpp
@@ -90,7 +90,7 @@
     return;
 }
 
-void USBManager::updateActivation(sdbusplus::message::message& msg)
+void USBManager::updateActivation(sdbusplus::message_t& msg)
 {
     std::map<std::string, std::map<std::string, std::variant<std::string>>>
         interfaces;