fp5280g2: Enable TFTP updates via Redfish

TFTP is already support within bmcweb via Redfish and by default that
was disabled. We need to enable it by default on fp5280g2 machine

Testd: Updated successfully via the following Redfish
curl -k -H "X-Auth-Token: $token" -X POST
https://${bmc}/redfish/v1/UpdateService/Actions/UpdateService.SimpleUpdate
-d
'{"TransferProtocol":"TFTP","ImageURI":"<ip address of TFTP server>/obmc-phosphor-image-fp5280g2-20190924042243.static.mtd.tar"}'

(From meta-inspur rev: a39ad069b6d9b0f9021495661da077a07ead1132)

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: Ic6b2e44b0680e4f4472e702aa51bff1416f6b944
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-inspur/meta-fp5280g2/recipes-phosphor/bmcweb/bmcweb_%.bbappend b/meta-inspur/meta-fp5280g2/recipes-phosphor/bmcweb/bmcweb_%.bbappend
new file mode 100644
index 0000000..934bb28
--- /dev/null
+++ b/meta-inspur/meta-fp5280g2/recipes-phosphor/bmcweb/bmcweb_%.bbappend
@@ -0,0 +1,3 @@
+EXTRA_OECMAKE_append = " \
+    -DBMCWEB_INSECURE_ENABLE_REDFISH_FW_TFTP_UPDATE=ON \
+    "