testsuites/ada: Introduce init.c files

Provide an init.c for each Ada test instead of the #include <config.h>
magic which works only due to hand crafted include paths.

Update #3818.

testsuites/ada/mptests/mp09/node1/init.c

@@ -0,0 +1,21 @@
+/*  config.h
+ *
+ *  This include file defines the Configuration Table for this test.
+ *
+ *  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may in
+ *  the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+
+/* configuration information */
+
+#define CONFIGURE_MP_APPLICATION
+#define CONFIGURE_MP_NODE_NUMBER                      1
+
+#include "../config_base.h"
+
+/* end of include file */