Missing pointer attribute

[hiker]

Several variables in declared in kern_call_arg_list (of #1883) missed a pointer attribute. Either add support the pointer attribute, or use an applicable work around (see psy_data_node).

This todo is mostly to mark up lines in kern_call_arg_list that need to be fixed, or moved (since it is not clear atm where the declaration will actually be added - kern_call_arg_list, or elsewhere).