Merge branch 'cocotb_dev' of github.com:efabless/caravel into cocotb_dev

manifest

@@ -52,6 +52,7 @@ e0c6ead5e35c1ba01d923c482e953c2af9691524  verilog/rtl/mprj_io_buffer.v
 669d16642d5dd5f6824812754db20db98c9fe17b  verilog/rtl/ring_osc2x13.v
 739ca5ed63a513d2e4c9bf3ecfad32d9fa527518  verilog/rtl/simple_por.v
 b9d6114a5067a04dd59cdd46fb988591c16743ce  verilog/rtl/spare_logic_block.v
+1b3841991197f80445991df23d90d7135b7ab617  verilog/rtl/toplevel_cocotb.v
 8f0bec01c914efe790a09ffe62bbfe0781069e35  verilog/rtl/xres_buf.v
 256190717faa72005cf7656d8443c4c0693b3f78  scripts/set_user_id.py
 98168b1fb6f80b196f9a05e725ec6ad99bc57ac6  scripts/generate_fill.py