DO NOT MERGE Fake 29.0 sepolicy prebuilts

I took current AOSP policy as base, then removed sepolicy so that the
set of type and attributes was a subset of types and attributes in Q
sepolicy, with exception of those that have not yet been cleand up in
current AOSP:

mediaswcodec_server
netd_socket
mediaextractor_update_service
thermalserviced
thermalserviced_exec

Bug: 133196056
Test: n/a
Change-Id: I2cbe749777684146114c89e1e6fc3f07400c0ae5
diff --git a/prebuilts/api/29.0/public/ephemeral_app.te b/prebuilts/api/29.0/public/ephemeral_app.te
new file mode 100644
index 0000000..dc39a22
--- /dev/null
+++ b/prebuilts/api/29.0/public/ephemeral_app.te
@@ -0,0 +1,14 @@
+###
+### Ephemeral apps.
+###
+### This file defines the security policy for apps with the ephemeral
+### feature.
+###
+### The ephemeral_app domain is a reduced permissions sandbox allowing
+### ephemeral applications to be safely installed and run. Non ephemeral
+### applications may also opt-in to ephemeral to take advantage of the
+### additional security features.
+###
+### PackageManager flags an app as ephemeral at install time.
+
+type ephemeral_app, domain;