py/objtuple: Move all tuple helper declarations to objtuple.h.

These helper functions assume their argument is of type `mp_obj_tuple_t` so
they have a better home in `py/objtuple.h`.

Also remove `mp_obj_tuple_hash()` because it doesn't have a corresponding
function defined anywhere (nor is it ever used).

Signed-off-by: Damien George <damien@micropython.org>

Author: dpgeorge

py/obj.h

@@ -1179,11 +1179,6 @@ mp_obj_t mp_obj_complex_binary_op(mp_binary_op_t op, mp_float_t lhs_real, mp_flo
 #define mp_obj_is_float(o) (false)
 #endif
 
-// tuple
-void mp_obj_tuple_get(mp_obj_t self_in, size_t *len, mp_obj_t **items);
-void mp_obj_tuple_del(mp_obj_t self_in);
-mp_int_t mp_obj_tuple_hash(mp_obj_t self_in);
-
 // dict
 typedef struct _mp_obj_dict_t {
     mp_obj_base_t base;

py/objtuple.h

@@ -45,6 +45,8 @@ mp_obj_t mp_obj_tuple_unary_op(mp_unary_op_t op, mp_obj_t self_in);
 mp_obj_t mp_obj_tuple_binary_op(mp_binary_op_t op, mp_obj_t lhs, mp_obj_t rhs);
 mp_obj_t mp_obj_tuple_subscr(mp_obj_t base, mp_obj_t index, mp_obj_t value);
 mp_obj_t mp_obj_tuple_getiter(mp_obj_t o_in, mp_obj_iter_buf_t *iter_buf);
+void mp_obj_tuple_get(mp_obj_t self_in, size_t *len, mp_obj_t **items);
+void mp_obj_tuple_del(mp_obj_t self_in);
 
 extern const mp_obj_type_t mp_type_attrtuple;