Set cflag for default max brightness

Change-Id: Iba7dd04915e9244323bace333240461a37f439ac
diff --git a/Android.mk b/Android.mk
index ae4b721..7e0d128 100644
--- a/Android.mk
+++ b/Android.mk
@@ -385,6 +385,7 @@
 else
     ifneq ($(TW_NO_SCREEN_BLANK),)
         TW_MAX_BRIGHTNESS ?= 1023
+        LOCAL_CFLAGS += -DTW_MAX_BRIGHTNESS=$(TW_MAX_BRIGHTNESS)
         $(call pretty-warning,TW_MAX_BRIGHTNESS must be defined if using TW_NO_SCREEN_BLANK. Setting to default value: $(TW_MAX_BRIGHTNESS). If you would like to use a different value then please update your device tree with the correct value from your device.)
     endif
 endif