feat(driver): Update to use apache license

components/esp8266/include/driver/spi_register.h

@@ -1,7 +1,16 @@
-/*
- *  Copyright (c) 2010 - 2011 Espressif System
- *
- */
+// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
 
 #ifndef SPI_REGISTER_H_INCLUDED
 #define SPI_REGISTER_H_INCLUDED