grove: add callback to GroveButton

Signed-off-by: Petre Eftime <petre.p.eftime@intel.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/grove/javaupm_grove.i

@@ -1,6 +1,14 @@
-%module javaupm_grove
+%module (directors="1", docstring="Basic Grove sensors") javaupm_grove
+
 %include "../upm.i"
 
+%feature("director") IsrCallback;
+
+%ignore generic_callback_isr;
+%include "../IsrCallback.h"
+
+%apply int {mraa::Edge}
+
 %{
     #include "grove.h"
 %}