Incorporate zhw_decode

[zhuanhao-wu]

This issue tracks the progress of incorporating the zhw_decode module from here into systemc-clang repository.

Changes to the design code/toolchain code will be tracked in separate issues.

• [x] Add source code for decoder
• [x] Pass the toolchain and generate Verilog
• [x] Synthesis/P&R results
• [x] Verification of correctness in simulation
• [x] Onboard verification of correctness
• [ ] Merge results back to main repository

[zhuanhao-wu]

Created a PR for adding source code #330

[zhuanhao-wu]

A preview of resource utilization result of synthesis with z7test after manual changes to the Verilog. Further verification is pending.

[zhuanhao-wu]

Updated resource utilization

[zhuanhao-wu]

Text version of utilization: util.txt