Add DO policy to disable safe boot mode.

Bug: 19615843
Change-Id: I14dbe911995ec216c57bd285d6b7b04c9684591a
diff --git a/services/core/java/com/android/server/pm/UserManagerService.java b/services/core/java/com/android/server/pm/UserManagerService.java
index e4f5e7d..26ecb72 100644
--- a/services/core/java/com/android/server/pm/UserManagerService.java
+++ b/services/core/java/com/android/server/pm/UserManagerService.java
@@ -918,6 +918,7 @@
         writeBoolean(serializer, restrictions, UserManager.DISALLOW_CROSS_PROFILE_COPY_PASTE);
         writeBoolean(serializer, restrictions, UserManager.DISALLOW_OUTGOING_BEAM);
         writeBoolean(serializer, restrictions, UserManager.DISALLOW_WALLPAPER);
+        writeBoolean(serializer, restrictions, UserManager.DISALLOW_SAFE_BOOT);
         serializer.endTag(null, TAG_RESTRICTIONS);
     }
 
@@ -1065,6 +1066,7 @@
         readBoolean(parser, restrictions, UserManager.DISALLOW_CROSS_PROFILE_COPY_PASTE);
         readBoolean(parser, restrictions, UserManager.DISALLOW_OUTGOING_BEAM);
         readBoolean(parser, restrictions, UserManager.DISALLOW_WALLPAPER);
+        readBoolean(parser, restrictions, UserManager.DISALLOW_SAFE_BOOT);
     }
 
     private void readBoolean(XmlPullParser parser, Bundle restrictions,