bta_gattc_co_cache_save() function

* Function bta_gattc_co_cache_save * Description This callout function is executed by GATT when a server cache * is available to save. * Parameter server_bda: server bd address of this cache belongs to * evt: call in event to be passed in when cache save is done. * num_attr: number of attribute to be save. * p_attr: pointer to the list of attributes to save. * attr_index: starting attribute index of the save operation. * conn_id: connection ID of this cache operation attach to. * Returns