Add product_available to product available modules am: 0277545b5d

Original change: https://android-review.googlesource.com/c/platform/external/libunwind/+/1495996

Change-Id: Ifc7704343e494ef2582fc19c43e4a25467bc16a7
diff --git a/Android.bp b/Android.bp
index 6f0a4eb..cfb05bc 100644
--- a/Android.bp
+++ b/Android.bp
@@ -343,6 +343,7 @@
     name: "libunwind_static",
     defaults: ["libunwind_core_defaults"],
     vendor_available: true,
+    product_available: true,
     native_bridge_supported: true,
 }
 
@@ -353,6 +354,7 @@
     name: "libunwindbacktrace",
     defaults: ["libunwind_defaults"],
     vendor_available: true,
+    product_available: true,
     native_bridge_supported: true,
     sdk_version: "21",
     srcs: [