display: Standardize log-tags for qcom display logs.

Change-Id: I75bc2d8db8d64994097d6b744f357c29c9a5717a
diff --git a/liblight/Android.mk b/liblight/Android.mk
index 93ece2f..40115d5 100644
--- a/liblight/Android.mk
+++ b/liblight/Android.mk
@@ -20,6 +20,7 @@
 LOCAL_SRC_FILES := lights.c
 LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
 LOCAL_SHARED_LIBRARIES := liblog
+LOCAL_CFLAGS := $(common_flags) -DLOG_TAG=\"qdlights\"
 LOCAL_MODULE := lights.$(TARGET_BOARD_PLATFORM)
 LOCAL_MODULE_TAGS := optional