verilator testbench: a few fixes
verilator testbench: a few fixes

- Return 0 for virtual keyboard device status (so it doesn't think
ESC is held down)
- Performance counter labels were mismatched

jbush001/NyuziProcessor,FulcronZ/NyuziProcessor,hoangt/NyuziProcessor,hoangt/NyuziProcessor,jbush001/NyuziProcessor,FulcronZ/NyuziProcessor,FulcronZ/NyuziProcessor,jbush001/NyuziProcessor,hoangt/NyuziProcessor,FulcronZ/NyuziProcessor,jbush001/NyuziProcessor,hoangt/NyuziProcessor,jbush001/NyuziProcessor,jbush001/NyuziProcessor