Allow RE2 on the product partition.

Needed by gRPC.

Bug: 302390540
Test: presubmit
Change-Id: I1a4eba58612bf00d2a48a9893960427a13472443
diff --git a/Android.bp b/Android.bp
index 8e56985..15b8abf 100644
--- a/Android.bp
+++ b/Android.bp
@@ -12,6 +12,7 @@
 cc_library_static {
     name: "libregex_re2",
     host_supported: true,
+    product_available: true,
     vendor_available: true,
     stl: "libc++",
     apex_available: [