Linux to posix conversion

Changed "linux" target to "posix". Most of the changes are shared with
QuRT and with OSX. The Linux specific parts are in for i2c which uses
<linux/i2c.h> and <linux/i2c-dev.h>.

There is also a check for __PX4_LINUX in mavlink for a tty ioctl that is
not supported.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/drivers/device/device.h

@@ -35,7 +35,7 @@
 
 #ifdef __PX4_NUTTX
 #include "device_nuttx.h"
-#elif defined (__PX4_LINUX)
+#elif defined (__PX4_POSIX)
 #include "vdev.h"
 #endif
 

src/drivers/device/i2c.h

@@ -35,5 +35,5 @@
 #ifdef __PX4_NUTTX
 #include "i2c_nuttx.h"
 #else
-#include "i2c_linux.h"
+#include "i2c_posix.h"
 #endif

src/drivers/device/i2c_posix.cpp

@@ -41,8 +41,10 @@
  */
 
 #include "i2c.h"
+#ifdef __PX4_LINUX
 #include <linux/i2c.h>
 #include <linux/i2c-dev.h>
+#endif
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>

src/drivers/device/i2c_posix.h

@@ -43,8 +43,10 @@
 #include "vdev.h"
 
 #include <px4_i2c.h>
+#ifdef __PX4_LINUX
 #include <linux/i2c.h>
 #include <linux/i2c-dev.h>
+#endif
 #include <string>
 
 namespace device __EXPORT

src/drivers/device/module.mk

@@ -44,11 +44,11 @@ SRCS =		  \
 		  spi.cpp \
 		  ringbuffer.cpp
 endif
-ifeq ($(PX4_TARGET_OS),linux)
+ifeq ($(PX4_TARGET_OS),posix)
 SRCS =		  vdev.cpp \
 		  device.cpp \
 		  vdev_posix.cpp \
-		  i2c_linux.cpp  \
+		  i2c_posix.cpp  \
 		  sim.cpp \
 		  ringbuffer.cpp
 endif