BTM_BleUpdateBgConnDev() function

* Function BTM_BleUpdateBgConnDev * Description This function is called to add or remove a device into/from * background connection procedure. The background connection procedure is decided by the background connection type, it can be auto connection, or selective connection. * Parameters add_remove: TRUE to add; FALSE to remove. * remote_bda: device address to add/remove. * Returns void