Build etc/hosts with Soong

Bug: 335369205
Test: build
Change-Id: I3a33e80dc751ddce874fe1345594e6dc5f27b36c
diff --git a/rootdir/Android.bp b/rootdir/Android.bp
index 6a3484e..9a64310 100644
--- a/rootdir/Android.bp
+++ b/rootdir/Android.bp
@@ -101,3 +101,9 @@
     src: "init.usb.configfs.rc",
     sub_dir: "init/hw",
 }
+
+prebuilt_etc {
+    name: "etc_hosts",
+    src: "etc/hosts",
+    filename: "hosts",
+}