fpga: rfnoc: fft: Use DEFAULT on reset in axis_cp_list

Original-commit: 2eba2e9303d84e1a66f9841f894d526f62d91901

lib/rfnoc/blocks/rfnoc_block_fft/axis_cp_list.sv

@@ -52,11 +52,11 @@ module axis_cp_list #(
   input  wire               i_tvalid,
   output wire               i_tready,
 
-  output reg  [DATA_W-1:0] o_tdata,
-  output reg               o_tvalid,
+  output logic [DATA_W-1:0] o_tdata = DEFAULT,
+  output logic              o_tvalid,
   input  wire               o_tready,
 
-  output wire [ADDR_W:0] occupied
+  output wire  [  ADDR_W:0] occupied
 );
 
   // Make addresses one extra bit wide to double as fullness and to detect the
@@ -156,7 +156,7 @@ module axis_cp_list #(
     if (rst | clear) begin
       rd_state <= ST_IDLE;
       rd_addr  <= '0;
-      o_tdata  <= '0;
+      o_tdata  <= DEFAULT;
       o_tvalid <= '0;
     end
   end