Remove the 'mod' parameter when specifying mocked method arguments

[tudortimi-ifx]

I think we can do away with the MOD argument to SVMOCK_FUNCn(...) and friends family of macros. If the argument has a composite type, it's possible to specify this directly. We would need to do a typdef inside the macro body, but this might actually be helpful for other stuff as well:

`SVMOCK_FUNC1(
    some_func, int,
    /*input*/, int[],  fred, /*no default*/
    )

In the macro expansion we would do something like:

typedef int[] fred_arg_type;

virtual function int some_func(fred_arg_type fred);
  // ...
endfunction