hps_accel: make renode-headless fails with verilator error

In proj/hps_accel, `make renode-headless` fails with the following verilator error.

```
-- Executing Verilator...
Verilator command: "/usr/bin/verilator_bin --compiler gcc --prefix Vcfu --Mdir /usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/build/renode/CMakeFiles/libVtop.dir/Vcfu.dir --make cmake --cc -y /usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel -Wno-WIDTH -Wno-CASEINCOMPLETE -Wno-CASEOVERLAP /usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/cfu.v"
Output:
%Error: /usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/cfu.v:6533:3: Cannot find file containing module: 'MULTADDSUB9X9WIDE'
6533 | MULTADDSUB9X9WIDE #(
| ^~~~~~~~~~~~~~~~~
... Looked in:
/usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/MULTADDSUB9X9WIDE
/usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/MULTADDSUB9X9WIDE.v
/usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/MULTADDSUB9X9WIDE.sv
MULTADDSUB9X9WIDE
MULTADDSUB9X9WIDE.v
MULTADDSUB9X9WIDE.sv
/usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/build/renode/CMakeFiles/libVtop.dir/Vcfu.dir/MULTADDSUB9X9WIDE
/usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/build/renode/CMakeFiles/libVtop.dir/Vcfu.dir/MULTADDSUB9X9WIDE.v
/usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/build/renode/CMakeFiles/libVtop.dir/Vcfu.dir/MULTADDSUB9X9WIDE.sv
%Error: /usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/cfu.v:6325:3: Cannot find file containing module: 'MULTADDSUB9X9WIDE'
6325 | MULTADDSUB9X9WIDE #(
| ^~~~~~~~~~~~~~~~~
%Error: /usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/cfu.v:6114:3: Cannot find file containing module: 'MULTADDSUB9X9WIDE'
6114 | MULTADDSUB9X9WIDE #(
| ^~~~~~~~~~~~~~~~~
%Error: /usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/cfu.v:5905:3: Cannot find file containing module: 'MULTADDSUB9X9WIDE'
5905 | MULTADDSUB9X9WIDE #(
| ^~~~~~~~~~~~~~~~~
%Error: /usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/cfu.v:5693:3: Cannot find file containing module: 'MULTADDSUB9X9WIDE'
5693 | MULTADDSUB9X9WIDE #(
| ^~~~~~~~~~~~~~~~~
%Error: /usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/cfu.v:5484:3: Cannot find file containing module: 'MULTADDSUB9X9WIDE'
5484 | MULTADDSUB9X9WIDE #(
| ^~~~~~~~~~~~~~~~~
%Error: /usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/cfu.v:5272:3: Cannot find file containing module: 'MULTADDSUB9X9WIDE'
5272 | MULTADDSUB9X9WIDE #(
| ^~~~~~~~~~~~~~~~~
%Error: /usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/cfu.v:5063:3: Cannot find file containing module: 'MULTADDSUB9X9WIDE'
5063 | MULTADDSUB9X9WIDE #(
| ^~~~~~~~~~~~~~~~~
%Error: Exiting due to 8 error(s)

CMake Error at /usr/share/verilator/verilator-config.cmake:212 (message):
Verilator command failed (return code=1)
Call Stack (most recent call first):
CMakeLists.txt:30 (verilate)

-- Configuring incomplete, errors occurred!
See also "/usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/build/renode/CMakeFiles/CMakeOutput.log".
See also "/usr/local/google/home/avg/src/CFU-Playground/proj/hps_accel/build/renode/CMakeFiles/CMakeError.log".
make: *** [../proj.mk:205: renode-scripts] Error 1
```