Recovery: partially revert change for TW_BRIGHTNESS_PATH makevar

Change-Id: Ia18f18b1e6989820baadfaa8aed47bd0786dece2
diff --git a/Android.mk b/Android.mk
index a9da18b..cc6c5ad 100644
--- a/Android.mk
+++ b/Android.mk
@@ -362,7 +362,7 @@
     LOCAL_CFLAGS += -DTW_USE_SERIALNO_PROPERTY_FOR_DEVICE_ID
 endif
 ifneq ($(TW_BRIGHTNESS_PATH),)
-	LOCAL_CFLAGS += -DTW_BRIGHTNESS_PATH=\"$(TW_BRIGHTNESS_PATH)\"
+	LOCAL_CFLAGS += -DTW_BRIGHTNESS_PATH=$(TW_BRIGHTNESS_PATH)
 endif
 ifneq ($(TW_SECONDARY_BRIGHTNESS_PATH),)
 	LOCAL_CFLAGS += -DTW_SECONDARY_BRIGHTNESS_PATH=$(TW_SECONDARY_BRIGHTNESS_PATH)