czw

arch: add support for spike finished: 1. add _putc() for spike todo: 1. add other system calls for spike

arch: add support for spike manual: 1. make ARCH=riscv64-spike 2. fix HAS_RVV to support v extension finished: 1. fix bug ```#include ``` in am/src/nemu/isa/riscv/cte64.c 3. add tohost link rules in...