Restructure RPi files (#827)

- Restructure SPi files for linux and RPi
- Update RPi revision detection (#826)

drivers/Linux/SPI.h

@@ -0,0 +1,31 @@
+/*
+ * The MySensors Arduino library handles the wireless radio link and protocol
+ * between your home built sensors/actuators and HA controller of choice.
+ * The sensors forms a self healing radio network with optional repeaters. Each
+ * repeater and gateway builds a routing tables in EEPROM which keeps track of the
+ * network topology allowing messages to be routed to nodes.
+ *
+ * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
+ * Copyright (C) 2013-2017 Sensnology AB
+ * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
+ *
+ * Documentation: http://www.mysensors.org
+ * Support Forum: http://forum.mysensors.org
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+#ifndef _SPI_H_
+#define _SPI_H_
+
+#ifdef LINUX_SPI_BCM
+#include "SPIBCM.h"
+#define SPI SPIBCM
+#elif LINUX_SPI_SPIDEV
+#include "SPIDEV.h"
+#define SPI SPIDEV
+#endif
+
+#endif