Static layout: Add dummy item_updater

This commit only adds the functions without implementation.

Tested: Verify the code compiles with or without static layout.

Change-Id: Id57640b367f9594d07e6780d446479eb7ac06007
Signed-off-by: Lei YU <mine260309@gmail.com>
diff --git a/static/Makefile.am.include b/static/Makefile.am.include
index 73f96e3..827e2fd 100644
--- a/static/Makefile.am.include
+++ b/static/Makefile.am.include
@@ -1,2 +1,2 @@
 openpower_update_manager_SOURCES += \
-	%reldir%/item_updater.cpp
+	%reldir%/item_updater_static.cpp