maa: Refactor maa build system and partly implement i2c

* API headers moved to api/
* smbus file added from libi2c and kernel i2c header cleaned up
* fix compilation of swig and use i2c.h header

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

include/smbus.hpp

@@ -0,0 +1,8 @@
+#pragma once
+
+// This header is required to remove the issues with g++ name mangling
+
+extern "C"
+{
+#include "smbus.h"
+}