fix target triplet and fix riscv-rootfs branch

[xyyy1420]

1. some linux distro installed toolchain will using riscv64-linux-gnu-, but riscv-toolchain cannot be compiled to get the riscv64-linux-gnu- prefix, so replace with riscv64-unknown-linux-gnu- could be better?

   • target-triplet

2. besides, build SimPoint profiling workload should use branch checkpoint in repo riscv-rootfs

3. fix writting error

4. add yylloc multiple definition problem solution

5. add riscv-pk need zicsr ext problem solution