[10 System Calls] not works on linux 5.15

[minghu6]

Because of sys_open was replaced by sys_openatin use, there is no way to test it. When switching to other syscall, print such as pr_info causing fatal page fault which crash the kernel.

[linD026]

Sure, sys_open is deprecated and some architectures don't support it. So, we could switch the implementation to sys_openat.

Thanks