[RFC] Move logic for test registration to the test harness (#2151)

And use in device_timer suite.

Signed-off-by: Kévin Petit <kpet@free.fr>

test_conformance/spirv_new/test_op_opaque.cpp

@@ -17,7 +17,7 @@
 #include "testBase.h"
 #include "types.hpp"
 
-TEST_SPIRV_FUNC(op_type_opaque_simple)
+REGISTER_TEST(op_type_opaque_simple)
 {
     const char *name = "opaque";
     cl_int err = CL_SUCCESS;