BTA_DmSetEncryption() function

* Function BTA_DmSetEncryption * Description This function is called to ensure that connection is * encrypted. Should be called only on an open connection. * Typically only needed for connections that first want to * bring up unencrypted links, then later encrypt them. * Parameters: bd_addr - Address of the peer device * transport - transport of the link to be encruypted * p_callback - Pointer to callback function to indicate the * link encryption status * sec_act - This is the security action to indicate * what kind of BLE security level is required for * the BLE link if the BLE is supported * Note: This parameter is ignored for the BR/EDR link * or the BLE is not supported * Returns void