app: aboot: Add support for tests framework

Add support to execute LK test framework through fastboot command.

Change-Id: I6fc816567ec27c76807df5740f96a9670fc48ece
diff --git a/app/rules.mk b/app/rules.mk
index e564fe0..0c06ce6 100644
--- a/app/rules.mk
+++ b/app/rules.mk
@@ -3,6 +3,11 @@
 MODULES += \
 	lib/openssl
 
+ifeq ($(ENABLE_UNITTEST_FW), 1)
+MODULES += \
+	app/tests
+endif
+
 OBJS += \
 	$(LOCAL_DIR)/app.o