support for rlt-1600g-w and rlt-1600x-w in GPON mode

Change-Id: Ib230d3e336043980eb00427384a49cb8bd386bb2
diff --git a/agent/device/rlt-1600x-w/mkdebian/debian/copyright b/agent/device/rlt-1600x-w/mkdebian/debian/copyright
new file mode 100644
index 0000000..0e527f0
--- /dev/null
+++ b/agent/device/rlt-1600x-w/mkdebian/debian/copyright
@@ -0,0 +1 @@
+(C) Copyright Broadcom Corporation 2003-2016