Create and clean existing syscalls interface

[Harthann]

Not all syscalls are currently callable from userspace due to improper user interface. And not all syscalls follow the same rules which is not ideal.
I think syscalls should follow the following pattern:

[syscall_name](params....) {
    // transfer userspace param into kernel space
    // call to real syscall (sys_[syscall_name] )
    // transform returned rust object into it's raw components to transfer into userspace
    // transfer data back to userspace
    // return
}

And so the sys_[syscall_name] will be the kernel interface for this sycall, allowing kernel to use syscall and receive rust object properly.