restore nvm module

Author: jepler

shared-bindings/nvm/__init__.c

@@ -50,3 +50,5 @@ const mp_obj_module_t nvm_module = {
     .base = { &mp_type_module },
     .globals = (mp_obj_dict_t *)&nvm_module_globals,
 };
+
+MP_REGISTER_MODULE(MP_QSTR_nvm, nvm_module, CIRCUITPY_NVM);