Make libbacktrace buildable for native_bridge

Bug: http://b/153609531

Test: m -j64 libbacktrace.native_bridge

Change-Id: I2b8a881b4e952f3b68dbcaeb14f147a6d955b406
diff --git a/libprocinfo/Android.bp b/libprocinfo/Android.bp
index 15b0d89..ae45742 100644
--- a/libprocinfo/Android.bp
+++ b/libprocinfo/Android.bp
@@ -27,6 +27,8 @@
     name: "libprocinfo",
     defaults: ["libprocinfo_defaults"],
     vendor_available: true,
+    // TODO(b/153609531): remove when no longer needed.
+    native_bridge_supported: true,
     recovery_available: true,
     vndk: {
         enabled: true,