test: log: Use UTF_CONSOLE in tests

Set this flag rather than doing things manually in the test.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/test/log.h b/include/test/log.h
index e902891..e3362b8 100644
--- a/include/test/log.h
+++ b/include/test/log.h
@@ -13,7 +13,8 @@
 #define LOGF_TEST (BIT(LOGF_FUNC) | BIT(LOGF_MSG))
 
 /* Declare a new logging test */
-#define LOG_TEST(_name) UNIT_TEST(_name, 0, log_test)
-#define LOG_TEST_FLAGS(_name, _flags) UNIT_TEST(_name, _flags, log_test)
+#define LOG_TEST(_name) UNIT_TEST(_name, UTF_CONSOLE, log_test)
+#define LOG_TEST_FLAGS(_name, _flags) \
+		UNIT_TEST(_name, _flags | UTF_CONSOLE, log_test)
 
 #endif /* __TEST_LOG_H__ */