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: Ibc88a5de1e7a11d332410985f29698b24aeae983
diff --git a/include/pcieslot.hpp b/include/pcieslot.hpp
index 7ed083f..d3c9588 100644
--- a/include/pcieslot.hpp
+++ b/include/pcieslot.hpp
@@ -42,7 +42,7 @@
     Pcie& operator=(Pcie&&) = delete;
     ~Pcie() = default;
 
-    Pcie(sdbusplus::bus::bus& bus, const std::string& objPath,
+    Pcie(sdbusplus::bus_t& bus, const std::string& objPath,
          const uint8_t& pcieId, uint8_t* smbiosTableStorage,
          const std::string& motherboard) :
         sdbusplus::server::object_t<PCIeSlot, location, embedded, item,