add /etc/passwd file to system to make wshell run correctly

Signed-off-by: Le Min <lemin9538@gmail.com>
change printk to kernel_debug to reduce print log

Signed-off-by: Le Min <lemin9538@gmail.com>
remove the redefination of syscall rtsigaction

Signed-off-by: Le Min <lemin9538@gmail.com>
add ioctl syscall but did not implemented

Signed-off-by: Le Min <lemin9538@gmail.com>
update the syscall getcwd

Signed-off-by: Le Min <lemin9538@gmail.com>
add syscall chdir do not test pass compile

Signed-off-by: Le Min <lemin9538@gmail.com>