clang-error: fix clang-diagnostic-defaulted-function-deleted error

The clang-diagnostic-defaulted-function-deleted error is generated when
explicitly defaulted move assignment operator is implicitly deleted.
This commit fixes those errors.

Change-Id: Id62b89eb3b58b819799194be91516f7c5e9cadc6
Signed-off-by: Pavithra Barithaya <pavithrabarithaya07@gmail.com>
diff --git a/item_updater_helper.hpp b/item_updater_helper.hpp
index 81d66d9..728af96 100644
--- a/item_updater_helper.hpp
+++ b/item_updater_helper.hpp
@@ -18,7 +18,7 @@
     Helper(const Helper&) = delete;
     Helper& operator=(const Helper&) = delete;
     Helper(Helper&&) = default;
-    Helper& operator=(Helper&&) = default;
+    Helper& operator=(Helper&&) = delete;
 
     /** @brief Constructor
      *
diff --git a/sync_watch.hpp b/sync_watch.hpp
index d85ac8c..f91ce29 100644
--- a/sync_watch.hpp
+++ b/sync_watch.hpp
@@ -36,7 +36,7 @@
     SyncWatch(const SyncWatch&) = delete;
     SyncWatch& operator=(const SyncWatch&) = delete;
     SyncWatch(SyncWatch&&) = default;
-    SyncWatch& operator=(SyncWatch&&) = default;
+    SyncWatch& operator=(SyncWatch&&) = delete;
 
     /** @brief dtor - remove inotify watch and close fd's
      */
diff --git a/usb/usb_manager.hpp b/usb/usb_manager.hpp
index afb3cec..0e781f7 100644
--- a/usb/usb_manager.hpp
+++ b/usb/usb_manager.hpp
@@ -22,7 +22,7 @@
     USBManager(const USBManager&) = delete;
     USBManager(USBManager&&) = default;
     USBManager& operator=(const USBManager&) = delete;
-    USBManager& operator=(USBManager&&) = default;
+    USBManager& operator=(USBManager&&) = delete;
 
     explicit USBManager(sdbusplus::bus_t& bus, sdeventplus::Event& event,
                         const fs::path& devPath, const fs::path& usbPath) :