Fix boot patch response code  expectation

Change-Id: Iac9ad54ece9c1eeb2d2d59a68c7707aeb227bc8e
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/redfish/systems/test_boot_devices.robot b/redfish/systems/test_boot_devices.robot
index bc1f0fb..a6d325a 100644
--- a/redfish/systems/test_boot_devices.robot
+++ b/redfish/systems/test_boot_devices.robot
@@ -106,6 +106,7 @@
     ${payload}=  Create Dictionary  Boot=${data}
 
     Redfish.Patch  /redfish/v1/Systems/system  body=&{payload}
+    ...  valid_status_codes=[${HTTP_OK},${HTTP_NO_CONTENT}]
 
     ${resp}=  Redfish.Get  /redfish/v1/Systems/system
     Should Be Equal As Strings  ${resp.dict["Boot"]["BootSourceOverrideEnabled"]}