aarch64: syscalls: clone: fix arg order

The clone syscal on aarch64 is the following:

```
SYS_clone, flags, stack, ptid, tls, ctid
x8,        x0,    x1,    x2,   x3,  x4
```

which is a different order than listed on the man page. Fix the ordering
in the aarch64 syscall dispatch code.

src/arch/arm64/exceptions/syscall.rs

@@ -256,8 +256,8 @@ pub async fn handle_syscall() {
                 arg1 as _,
                 UA::from_value(arg2 as _),
                 UA::from_value(arg3 as _),
-                UA::from_value(arg4 as _),
+                UA::from_value(arg5 as _),
-                arg5 as _,
+                arg4 as _,
             )
             .await
         }