Support for more binder caches

Bug: 140788621

This adds keys for several planned binder caches in the system server
and in the bluetooth server.  The actual cache code is not in this
tree.

Test: created a test build that contains the actual cache code and ran
some system tests.  Verified that no protection issues were seen.

Change-Id: Ibaccb0c0ff8b127d14cf769ea4156f7d8b024bc1
diff --git a/private/bluetooth.te b/private/bluetooth.te
index b96fc58..1680361 100644
--- a/private/bluetooth.te
+++ b/private/bluetooth.te
@@ -40,6 +40,9 @@
 allow bluetooth proc_bluetooth_writable:file rw_file_perms;
 
 # Allow write access to bluetooth specific properties
+set_prop(bluetooth, binder_cache_bluetooth_server_prop);
+neverallow { domain -bluetooth -init }
+    binder_cache_bluetooth_server_prop:property_service set;
 set_prop(bluetooth, bluetooth_a2dp_offload_prop)
 set_prop(bluetooth, bluetooth_audio_hal_prop)
 set_prop(bluetooth, bluetooth_prop)