py: Put micropython module init code in builtinmp.c.
diff --git a/py/builtin.h b/py/builtin.h
index ca5c8a5..050a216 100644
--- a/py/builtin.h
+++ b/py/builtin.h
@@ -27,6 +27,4 @@
 MP_DECLARE_CONST_FUN_OBJ(mp_builtin_sum_obj);
 MP_DECLARE_CONST_FUN_OBJ(mp_builtin_str_obj);
 
-MP_DECLARE_CONST_FUN_OBJ(mp_builtin_mem_total_obj);
-MP_DECLARE_CONST_FUN_OBJ(mp_builtin_mem_current_obj);
-MP_DECLARE_CONST_FUN_OBJ(mp_builtin_mem_peak_obj);
+void mp_module_micropython_init(void);