fpga: updating b200 and x300 FPGA source code for latest images

Original-commit: 00711ba213dde8aa0a099d2b18d3da0a33e6af79

lib/io_port2/pcie_lossy_samp_gate.v

@@ -0,0 +1,26 @@
+//
+// Copyright 2013 Ettus Research LLC
+//
+
+
+module pcie_lossy_samp_gate
+(
+   input [63:0]   i_tdata,
+   input          i_tvalid,
+   output         i_tready,
+   
+   output [63:0]  o_tdata,
+   output         o_tvalid,
+   input          o_tready,
+   
+   input          drop,
+   output         dropping
+);
+
+   assign o_tdata    = i_tdata;
+   assign o_tvalid   = i_tvalid & ~drop;
+   assign i_tready   = o_tready | drop;
+   
+   assign dropping   = drop & i_tvalid;
+   
+endmodule // pcie_lossy_samp_gate