Don't show UI on default encryption

Merge of https://googleplex-android-review.git.corp.google.com/#/c/764976

Bug: 22989588
Change-Id: I3a6b01ee80446e0955e2039f88a627d37ee6caef
diff --git a/vdc.rc b/vdc.rc
index e842869..d5483d0 100644
--- a/vdc.rc
+++ b/vdc.rc
@@ -6,7 +6,7 @@
     # encryption) or trigger_restart_min_framework (other encryption)
 
 # One shot invocation to encrypt unencrypted volumes
-service encrypt /system/bin/vdc --wait cryptfs enablecrypto inplace default
+service encrypt /system/bin/vdc --wait cryptfs enablecrypto inplace default noui
     disabled
     oneshot
     # vold will set vold.decrypt to trigger_restart_framework (default