Build init-debug.rc with Soong

Bug: 335369205
Test: build and compare
Change-Id: Idb6105e8527e3a2b4f0517b31be3fa8b78826880
diff --git a/rootdir/Android.bp b/rootdir/Android.bp
index 9a64310..06227c3 100644
--- a/rootdir/Android.bp
+++ b/rootdir/Android.bp
@@ -107,3 +107,9 @@
     src: "etc/hosts",
     filename: "hosts",
 }
+
+prebuilt_etc {
+    name: "init-debug.rc",
+    src: "init-debug.rc",
+    sub_dir: "init",
+}