selftests: copy TEST_DIRS to INSTALL_PATH

Loop over all TEST_DIRS and recursively copy them to the INSTALL_PATH. Tests
such as ftrace require a directory and all of it's contents to execute the
test properly, thus these directories and files need to be copied when we
perform an install.
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Tyler Baker <tyler.baker@linaro.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/lib.mk

@@ -13,6 +13,9 @@ run_tests: all
 
 define INSTALL_RULE
 	mkdir -p $(INSTALL_PATH)
+	@for TEST_DIR in $(TEST_DIRS); do\
+		cp -r $$TEST_DIR $(INSTALL_PATH); \
+	done;
 	install -t $(INSTALL_PATH) $(TEST_PROGS) $(TEST_PROGS_EXTENDED) $(TEST_FILES)
 endef