Pass device characteristic information through to aapt.

A build configuration can define PRODUCT_CHARACTERISTICS, which is
a comma-separated list of device characteristics, for example
"nosdcard,grayscale".  This will be passed through to aapt with
the --product flag.

Change-Id: I902c034b2f2824dbd2d33449308ee08beeb09551
diff --git a/core/definitions.mk b/core/definitions.mk
index 6f7d2a3..6232668 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -1367,6 +1367,7 @@
     $(addprefix -I , $(PRIVATE_AAPT_INCLUDES)) \
     $(addprefix --min-sdk-version , $(DEFAULT_APP_TARGET_SDK)) \
     $(addprefix --target-sdk-version , $(DEFAULT_APP_TARGET_SDK)) \
+    $(addprefix --product , $(TARGET_AAPT_CHARACTERISTICS)) \
     $(if $(filter --version-code,$(PRIVATE_AAPT_FLAGS)),,$(addprefix --version-code , $(PLATFORM_SDK_VERSION))) \
     $(if $(filter --version-name,$(PRIVATE_AAPT_FLAGS)),,$(addprefix --version-name , $(PLATFORM_VERSION))) \
     $(addprefix --rename-manifest-package , $(PRIVATE_MANIFEST_PACKAGE_NAME)) \