fbwifi: update to git HEAD

bf7b0c4 fbwifi: add SPDX and copyright headers
 5318143 fbwifi: open https port in FBWIFI_INPUT

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

feeds/facebook/fbwifi/files/usr/lib/lua/fbwifi.lua

@@ -1,3 +1,6 @@
+-- SPDX-License-Identifier: GPL-2.0-only
+-- Copyright (c) Facebook, Inc. and its affiliates.
+--
 -- FBWIFI Lua library
 -- function table
 local fbwifi = {}