Start authfs_service during boot on microdroid

Bug: 194717985
Test: see the service starts on boot
Test: MicrodroidHostTestCases
Change-Id: Ia91cf6d8316bfd95ba3a0ea1fb45c64422c2f85f
diff --git a/microdroid/init.rc b/microdroid/init.rc
index d43ab22..f9cd915 100644
--- a/microdroid/init.rc
+++ b/microdroid/init.rc
@@ -136,6 +136,9 @@
 
     start keystore2
 
+    mkdir /data/misc/authfs 0700 root root
+    start authfs_service
+
 on late-fs
     start vendor.keymint-microdroid