test: Drop the _test suffix on linker lists

Most test suites have a _test suffix. This is not necessary as there is
also a ut_ prefix.

Drop the suffix so that (with future work) the suite name can be used as
the linker-list name.

Remove the suffix from the pytest regex as well, moving it to the top of
the file, as it is a constant.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/test/overlay.h b/include/test/overlay.h
index c13f4d6..5dc9839 100644
--- a/include/test/overlay.h
+++ b/include/test/overlay.h
@@ -10,6 +10,6 @@
 #include <test/test.h>
 
 /* Declare a new environment test */
-#define OVERLAY_TEST(_name, _flags)	UNIT_TEST(_name, _flags, overlay_test)
+#define OVERLAY_TEST(_name, _flags)	UNIT_TEST(_name, _flags, overlay)
 
 #endif /* __TEST_OVERLAY_H__ */