test: Tweak FDT-overlay tests

Use fdt_overlay consistently in the identifiers and file/dir names.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/test/overlay.h b/include/test/fdt_overlay.h
similarity index 67%
rename from include/test/overlay.h
rename to include/test/fdt_overlay.h
index 5dc9839..34e8020 100644
--- a/include/test/overlay.h
+++ b/include/test/fdt_overlay.h
@@ -9,7 +9,7 @@
 
 #include <test/test.h>
 
-/* Declare a new environment test */
-#define OVERLAY_TEST(_name, _flags)	UNIT_TEST(_name, _flags, overlay)
+/* Declare a new FDT-overlay test */
+#define FDT_OVERLAY_TEST(_name, _flags)	UNIT_TEST(_name, _flags, fdt_overlay)
 
 #endif /* __TEST_OVERLAY_H__ */
diff --git a/include/test/suites.h b/include/test/suites.h
index 774dd89..dce720b 100644
--- a/include/test/suites.h
+++ b/include/test/suites.h
@@ -36,8 +36,8 @@
 
 int do_ut_bootstd(struct unit_test_state *uts, struct cmd_tbl *cmdtp, int flag,
 		  int argc, char *const argv[]);
+int do_ut_fdt_overlay(struct unit_test_state *uts, struct cmd_tbl *cmdtp,
+		      int flag, int argc, char *const argv[]);
 int do_ut_optee(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
-int do_ut_overlay(struct unit_test_state *uts, struct cmd_tbl *cmdtp, int flag,
-		  int argc, char *const argv[]);
 
 #endif /* __TEST_SUITES_H__ */