fpga: rfnoc: fft: Add FFT packetize modules

Original-commit: 97ea89fac5c1889e5c0da44349d5f4be3d788965

lib/rfnoc/blocks/rfnoc_block_fft/fft_packetize_pkg.sv

@@ -0,0 +1,31 @@
+//
+// Copyright 2025 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+//
+// Module: fft_packetize_pkg
+//
+// Description:
+//
+//   Package file for fft_packetize and fft_depacketize.
+//
+
+
+package fft_packetize_pkg;
+
+  import rfnoc_chdr_utils_pkg::*;
+
+  typedef struct packed {
+    logic [CHDR_TIMESTAMP_W-1:0] timestamp;
+    logic                        has_time;
+    logic [CHDR_LENGTH_W-1:0]    length;
+  } burst_info_t;
+
+  typedef struct packed {
+    logic last;
+  } symbol_info_t;
+
+  localparam int BURST_INFO_W  = $bits(burst_info_t);
+  localparam int SYMBOL_INFO_W = $bits(symbol_info_t);
+
+endpackage : fft_packetize_pkg