riscv32: add new syscall numbers

- add mount_setattr from linux v5.12
- add epoll_pwait2 from linux v5.11
- add process_madvise from linux v5.10
- add __NR_faccessat2 from linux v5.8
- add pidfd_getfd and openat2 syscall numbers from linux v5.6
- add clone3 syscall number from linux v5.3
- add process_mrelease from linux v5.15
- add futex_waitv from linux v5.16
- add set_mempolicy_home_node from linux v5.17
- add cachestat from linux v6.4
- add __NR_fchmodat2 from linux v6.6
1 file changed