fpga: rfnoc: Move synthesizable code from sim to lib

Original-commit: d9f8c08dfb1afe98c35c5911125c6eead869713f

lib/rfnoc/blocks/rfnoc_block_split_stream/rfnoc_block_split_stream_tb.sv

@@ -23,7 +23,8 @@ module rfnoc_block_split_stream_tb #(
   `include "test_exec.svh"
 
   import PkgTestExec::*;
-  import PkgChdrUtils::*;
+  import rfnoc_chdr_utils_pkg::*;
+  import PkgChdrData::*;
   import PkgRfnocBlockCtrlBfm::*;
   import PkgRfnocItemUtils::*;