Update make clean target with moved test helpers

Test helpers that are now moved to the framework must be cleaned
properly.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/tests/Makefile b/tests/Makefile
index cb3c981..a92064d 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -228,7 +228,8 @@
 clean:
 ifndef WINDOWS
 	rm -rf $(BINARIES) *.c *.datax
-	rm -f src/*.o src/drivers/*.o src/test_helpers/*.o src/libmbed*
+	rm -f src/*.o src/test_helpers/*.o src/libmbed*
+	rm -f ../framework/tests/src/*.o ../framework/tests/src/drivers/*.o
 	rm -f include/test/instrument_record_status.h
 	rm -f include/alt-extra/*/*_alt.h
 	rm -rf libtestdriver1
@@ -238,9 +239,10 @@
 	if exist *.exe del /Q /F *.exe
 	if exist *.datax del /Q /F *.datax
 	if exist src/*.o del /Q /F src/*.o
-	if exist src/drivers/*.o del /Q /F src/drivers/*.o
 	if exist src/test_helpers/*.o del /Q /F src/test_helpers/*.o
 	if exist src/libmbed* del /Q /F src/libmbed*
+	if exist ../framework/tests/src/*.o del /Q /F ../framework/tests/src/*.o
+	if exist ../framework/tests/src/drivers/*.o del /Q /F ../framework/tests/src/drivers/*.o
 	if exist include/test/instrument_record_status.h del /Q /F include/test/instrument_record_status.h
 endif