Mark //bionic filegroups/genrules as bp2build_available.

Test: GENERATE_BAZEL_FILES=true m nothing && build/bazel/scripts/bp2build-sync.sh write && bazel build //bionic/...
Change-Id: Ie3e0092a3a03ddc6228a9191e5b78ab206072dde
diff --git a/tools/Android.bp b/tools/Android.bp
index c540c3c..dfeea19 100644
--- a/tools/Android.bp
+++ b/tools/Android.bp
@@ -3,4 +3,5 @@
 filegroup {
     name: "bionic-generate-version-script",
     srcs: ["generate-version-script.py"],
+    bazel_module: { bp2build_available: true },
 }