XiangShan-2 (NANHU) with DFT and SoC enhancements
This is the second generation of XiangShan (NANHU)
with some DFT and SoC enhancements.
- SCAN, shared bus MBIST support
- Update memory map for larger physical address space
- Fix real-time clock for CLINT
- Add support for external reset vector
- Other fixes and enhancements
