maa: add global maa.h and maa.hpp and stop using /usr/include/maa/

* pkg-config now only sees maa.h & maa.hpp
* usage of maa/*.{h,hpp} is still allowed
* examples updated to use maa.{h,hpp}

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

examples/blink-io.c

@@ -28,7 +28,7 @@
 #include <signal.h>
 #include <stdlib.h>
 
-#include "gpio.h"
+#include "maa.h"
 
 #define DEFAULT_IOPIN 8