Adding default value of force_update to variable section

Change-Id: I92a3d70034f6ba825d6159b121674a90622aab69
Signed-off-by: Sushil Singh <susilsi7@in.ibm.com>
diff --git a/redfish/extended/redfish_bmc_code_update.robot b/redfish/extended/redfish_bmc_code_update.robot
index c9cc03a..921ae1a 100644
--- a/redfish/extended/redfish_bmc_code_update.robot
+++ b/redfish/extended/redfish_bmc_code_update.robot
@@ -27,6 +27,11 @@
 
 Force Tags               BMC_Code_Update
 
+*** Variables ***
+
+${FORCE_UPDATE}          ${0}
+
+
 *** Test Cases ***
 
 Redfish BMC Code Update