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simple wrapper around til_setup_t.free()
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For use when setup functions allocate their private setup to
return in *res_setup.
They specify the size of their private setup, and supply the free
function to use. This may be libc's free() when it's a simple
setup struct, or a bespoke free function when deep/complex
freeing is required for cleanup.
It's expected that callers will be embedding til_setup_t at the
start of their private setup struct, and returning a pointer to
this in *res_setup which would be the same value as a pointer to
to their private setup struct.
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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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