Support Rust in Product

Bug: 178565008
Bug: 165791368
Test: Build and link a Rust library into a product binary
Change-Id: I9c5aa5f3a1f323af9aa2aee804635045f1b91bd4
diff --git a/cc/androidmk.go b/cc/androidmk.go
index df3776c..1f08a01 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -25,7 +25,7 @@
 
 var (
 	nativeBridgeSuffix  = ".native_bridge"
-	productSuffix       = ".product"
+	ProductSuffix       = ".product"
 	VendorSuffix        = ".vendor"
 	ramdiskSuffix       = ".ramdisk"
 	VendorRamdiskSuffix = ".vendor_ramdisk"