liblog: use log/log.h for ALOG macros

Test: compile
Bug: 30465923
Change-Id: I247151363604714088b6059279702702b4e9f89a
diff --git a/services/audioflinger/tests/test_utils.h b/services/audioflinger/tests/test_utils.h
index 283c768..b61a929 100644
--- a/services/audioflinger/tests/test_utils.h
+++ b/services/audioflinger/tests/test_utils.h
@@ -17,6 +17,12 @@
 #ifndef ANDROID_AUDIO_TEST_UTILS_H
 #define ANDROID_AUDIO_TEST_UTILS_H
 
+#ifndef LOG_TAG
+#define LOG_TAG "test_utils"
+#endif
+
+#include <log/log.h>
+
 #include <audio_utils/sndfile.h>
 
 #ifndef ARRAY_SIZE