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/shared_relro.te b/prebuilts/api/29.0/private/shared_relro.te
new file mode 100644
index 0000000..02f7206
--- /dev/null
+++ b/prebuilts/api/29.0/private/shared_relro.te
@@ -0,0 +1,5 @@
+typeattribute shared_relro coredomain;
+
+# The shared relro process is a Java program forked from the zygote, so it
+# inherits from app to get basic permissions it needs to run.
+app_domain(shared_relro)