Convert versioner to Android.bp

See build/soong/README.md for more information.

Test: mma -j
Change-Id: I0e648143ac480c1257d9829f9b9087ee22005855
diff --git a/tools/versioner/Android.bp b/tools/versioner/Android.bp
new file mode 100644
index 0000000..061709a
--- /dev/null
+++ b/tools/versioner/Android.bp
@@ -0,0 +1,3 @@
+subdirs = [
+    "src",
+]