[Minipack] Modify fbfpgaiomodule.c to support both python2 and python3 (#7604)

Modify fbfpgaiomodule.c to support both python2 and python3

Signed-off-by: chiourung_huang <chiourung_huang@edge-core.com>

platform/broadcom/sonic-platform-modules-accton/minipack/lib/fbfpgaiomodule.c

@@ -109,10 +109,7 @@ static PyMethodDef FbfpgaMethods[] = {
   { NULL, NULL, 0, NULL },
 };
 
-PyMODINIT_FUNC
-initfbfpgaio(void)
-{
-  char docstr[] = "\
+static char docstr[] = "\
 1. hw_init():\n\
    return value: True/False\n\
 2. hw_release():\n\
@@ -122,5 +119,26 @@ initfbfpgaio(void)
      In reading operation: data which is read from FPGA\n\
      In writing operation: None\n";
 
+#if PY_MAJOR_VERSION < 3
+PyMODINIT_FUNC
+initfbfpgaio(void)
+{
   (void) Py_InitModule3("fbfpgaio", FbfpgaMethods, docstr);
 }
+#else
+static struct PyModuleDef FbfpgaModule =
+{
+    PyModuleDef_HEAD_INIT,
+    "fbfpgaio", /* name of module */
+    docstr,
+    -1,   /* size of per-interpreter state of the module, or -1 if the module keeps state in global variables. */
+    FbfpgaMethods
+};
+
+PyMODINIT_FUNC
+PyInit_fbfpgaio(void)
+{
+  return PyModule_Create(&FbfpgaModule);
+}
+#endif
+