Start authfs_service during boot on microdroid

Bug: 194717985
Test: see the service starts on boot
Test: MicrodroidHostTestCases
Change-Id: Ia91cf6d8316bfd95ba3a0ea1fb45c64422c2f85f
diff --git a/authfs/service/Android.bp b/authfs/service/Android.bp
index 3f3a0c3..943db35 100644
--- a/authfs/service/Android.bp
+++ b/authfs/service/Android.bp
@@ -19,4 +19,5 @@
         "libshared_child",
     ],
     prefer_rlib: true,
+    init_rc: ["authfs_service.rc"],
 }