Move screen density config from PRODUCT_LOCALES to PRODUCT_AAPT_CONFIG

With this change, PRODUCT_LOCALES will contain only locales.
Other aapt config flags, such as *dpi, small/normal/large/xlarge,
should go to PRODUCT_AAPT_CONFIGS.
Bug: 4086309

Change-Id: I922f153d79777a9522c542a3907111193b40e7b7
diff --git a/core/product.mk b/core/product.mk
index cc62e10..7182b81 100644
--- a/core/product.mk
+++ b/core/product.mk
@@ -63,6 +63,7 @@
     PRODUCT_NAME \
     PRODUCT_MODEL \
     PRODUCT_LOCALES \
+    PRODUCT_AAPT_CONFIG \
     PRODUCT_PACKAGES \
     PRODUCT_DEVICE \
     PRODUCT_MANUFACTURER \