fpga: lib: rfnoc: Support multiple port widths on crossbar

This adds support for different widths on each port and adds the
ability to disable routes within the crossbar. Both of these features
allow for FPGA resource savings.

These features are controlled by the new parameters PORT_WIDTHS and
ENABLED_PATHS. Unused routes will have the associated logic removed.

A new testbench adds support for testing different port widths and
disabled routes. It also adds more rigrous testing of the crossbar.


Original-commit: 18bf81d91055b68765c44ca86a2cbcfa9704c749

lib/rfnoc/sim/chdr_stream_endpoint_tb/chdr_stream_endpoint_tb.sv

@@ -187,10 +187,10 @@ module chdr_stream_endpoint_tb#(
   );
 
   chdr_crossbar_nxn #(
-    .CHDR_W         (CHDR_W),
+    .PORT_W         (CHDR_W),
     .NPORTS         (3),
     .DEFAULT_PORT   (0),
-    .MTU            (MTU),
+    .BYTE_MTU       (MTU + $clog2(CHDR_W/8)),
     .ROUTE_TBL_SIZE (6),
     .MUX_ALLOC      ("ROUND-ROBIN"),
     .OPTIMIZE       ("AREA"),