fw-update : Optimize passing infra parameters

Refactor UpdateManager and DeviceUpdater to optimize passing the D-Bus event
loop handle, handler for requester and instance ID requester.

Signed-off-by: Tom Joseph <rushtotom@gmail.com>
Change-Id: I1860ffc49513d941af372423a197b1d42eda6e36
diff --git a/fw-update/update_manager.hpp b/fw-update/update_manager.hpp
index c942e38..5d4fe47 100644
--- a/fw-update/update_manager.hpp
+++ b/fw-update/update_manager.hpp
@@ -93,12 +93,12 @@
                               TotalComponentUpdates& totalNumComponentUpdates);
 
     const std::string swRootPath{"/xyz/openbmc_project/software/"};
-
-  private:
     Event& event; //!< reference to PLDM daemon's main event loop
     /** @brief PLDM request handler */
     pldm::requester::Handler<pldm::requester::Request>& handler;
     Requester& requester; //!< reference to Requester object
+
+  private:
     /** @brief Device identifiers of the managed FDs */
     const DescriptorMap& descriptorMap;
     /** @brief Component information needed for the update of the managed FDs */