py/stream: Adjust mp_stream_posix_XXX to take void*, not mp_obj_t.

These POSIX wrappers are assumed to be passed a concrete stream object so
it is more efficient (eg on nan-boxing builds) to pass in the pointer
rather than mp_obj_t, because then the users of these functions only need
to store a void* (and mp_obj_t may be wider than a pointer).  And things
would be further improved if the stream protocol functions eventually took
a pointer as their first argument (instead of an mp_obj_t).

This patch is a step to getting ussl/axtls compiling on nan-boxing builds.

See issue #3085.

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