Add friendly_name to device (#4296)

esphome/components/api/api_connection.cpp

@@ -930,6 +930,7 @@ DeviceInfoResponse APIConnection::device_info(const DeviceInfoRequest &msg) {
   DeviceInfoResponse resp{};
   resp.uses_password = this->parent_->uses_password();
   resp.name = App.get_name();
+  resp.friendly_name = App.get_friendly_name();
   resp.mac_address = get_mac_address_pretty();
   resp.esphome_version = ESPHOME_VERSION;
   resp.compilation_time = App.get_compilation_time();