Migrate multiple_device_context suite to the new test registration framework (#2325)

Contributes to #2181.

Signed-off-by: Ahmed Hesham <ahmed.hesham@arm.com>

test_conformance/multiple_device_context/testBase.h

@@ -1,6 +1,6 @@
 //
 // Copyright (c) 2017 The Khronos Group Inc.
-// 
+//
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
@@ -16,16 +16,8 @@
 #ifndef _testBase_h
 #define _testBase_h
 
-#include "harness/compat.h"
-
-#include <stdio.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-
-#include "procs.h"
+#include "harness/conversions.h"
+#include "harness/testHarness.h"
+#include "harness/kernelHelpers.h"
 
 #endif // _testBase_h
-
-
-