tests/drv_hangman: Convert to using central list of engines

Rather than encoding our own list of engines, use the common one for
greater coverage.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/lib/igt_gt.h b/lib/igt_gt.h
index d4a582e..b7c5c4a 100644
--- a/lib/igt_gt.h
+++ b/lib/igt_gt.h
@@ -93,6 +93,7 @@
 
 extern const struct intel_execution_engine {
 	const char *name;
+	const char *full_name;
 	unsigned exec_id;
 	unsigned flags;
 } intel_execution_engines[];