Add new untrusted_v2_app domain

untrusted_v2_app is basically a refinement of untrusted_app with legacy
capabilities removed and potentially backwards incompatible changes.

This is not currently hooked up to anything.

Bug: 33350220
Test: builds
Change-Id: Ic9fad57476bc2b6022b1eaca8667bf6d844753c2
diff --git a/public/untrusted_v2_app.te b/public/untrusted_v2_app.te
new file mode 100644
index 0000000..ac82f15
--- /dev/null
+++ b/public/untrusted_v2_app.te
@@ -0,0 +1,5 @@
+###
+### Untrusted v2 sandbox apps.
+###
+
+type untrusted_v2_app, domain;