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/private/users b/prebuilts/api/29.0/private/users
new file mode 100644
index 0000000..51b7b57
--- /dev/null
+++ b/prebuilts/api/29.0/private/users
@@ -0,0 +1 @@
+user u roles { r } level s0 range s0 - mls_systemhigh;