Add untrusted_app_27

This is a partial cherry pick of commit 6231b4d9
'Enforce per-app data protections for targetSdk 28+'.

Untrusted_app_27 remains unreachable, but it's existence
prevents future merge conflicts.

Bug: 63897054
Test: build/boot aosp_walleye-userdebug
Change-Id: I64b013874fe87b55f47e817a1279e76ecf86b7c0
Merged-In: I64b013874fe87b55f47e817a1279e76ecf86b7c0
(cherry picked from commit 6231b4d9fc98bb42956198e9f54cabde69464339)
diff --git a/private/app_neverallows.te b/private/app_neverallows.te
index f998e55..4b79060 100644
--- a/private/app_neverallows.te
+++ b/private/app_neverallows.te
@@ -8,6 +8,7 @@
   mediaprovider
   untrusted_app
   untrusted_app_25
+  untrusted_app_27
   untrusted_app_all
   untrusted_v2_app
 }')