meta-ampere: Disable unsecured TFTP firmware update

Disable this option to does not support TFTP firmware update as it is
an unsecured protocol.

Tested:
1. On Webui, Configuration -> Firmware. No more option TFTP server on
Update firmware.

Signed-off-by: Hieu Huynh <hieuh@os.amperecomputing.com>
Change-Id: I8cb3285154b62ac2ee026485ad3f1d9d9586a016
diff --git a/meta-ampere/meta-common/recipes-phosphor/interfaces/bmcweb_%.bbappend b/meta-ampere/meta-common/recipes-phosphor/interfaces/bmcweb_%.bbappend
index 584ce60..bae82ce 100644
--- a/meta-ampere/meta-common/recipes-phosphor/interfaces/bmcweb_%.bbappend
+++ b/meta-ampere/meta-common/recipes-phosphor/interfaces/bmcweb_%.bbappend
@@ -1,7 +1,7 @@
 FILESEXTRAPATHS:append := "${THISDIR}/${PN}:"
 
 EXTRA_OEMESON:append = " \
-     -Dinsecure-tftp-update=enabled \
+     -Dinsecure-tftp-update=disabled \
      -Dbmcweb-logging=enabled \
      -Dredfish-bmc-journal=enabled \
      "