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/gpio_read6.c

@@ -25,7 +25,7 @@
 #include "stdio.h"
 #include "unistd.h"
 
-#include "gpio.h"
+#include "maa.h"
 
 int
 main(int argc, char **argv)