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Preparatory commit for providing a res_setup type to replace
void*.
The impetus for this isn't just pursuit of less void*, but
primarily implementing setup freeing by embedding this struct
into the private setup types.
An alternative method of adding setup freeing would have been to
introduce something like til_module_t.free_setup(). But that
would require having the til_module_t on hand, and the whole
setup machinery is more generalized than til_module_t anyways.
This way anything can simply embed the struct in their private
setup instance and return the pointer to that in *res_setup.
They should always be able to find their containing struct's
offset from the til_setup_t* they returned. Either by using
container_of(), or simply placing it at the start of the private
setup struct.
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