Support for building more modules with Linux

Added more queue support to linux/px4_layer.

Use virt char devices for ms5611, and mavlink.

Added more HRT functionality. uORB latency test
now fails. Likely due to bad HRT impl for Linux.

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

src/drivers/ms5611/ms5611_spi.cpp

@@ -44,7 +44,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <assert.h>
-#include <debug.h>
+//#include <debug.h>
 #include <errno.h>
 #include <unistd.h>