upm.i: add top level interface file which includes std_string.i

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

src/mma7455/jsupm_mma7455.i

@@ -1,4 +1,5 @@
 %module jsupm_mma7455
+%include "../upm.i"
 
 %{
     #include "mma7455.h"

src/mma7455/pyupm_mma7455.i

@@ -1,4 +1,5 @@
 %module pyupm_mma7455
+%include "../upm.i"
 
 %feature("autodoc", "3");