Find hal_foo_hwservice -> you are hal_foo_client.

Before, it was possible to access a hwservice without declaring
that you were a client.

This introduces the following macro:
hal_attribute_hwservice_client(hal_foo, hal_foo_hwservice)

which makes sure the above implication holds using a neverallow rule.

Bug: 80319537
Test: boot + sanity
Change-Id: Iededae68f14f0f3bd412c1205aa3b650a54d55c6
diff --git a/public/hal_bluetooth.te b/public/hal_bluetooth.te
index 373dbec..b0c68bf 100644
--- a/public/hal_bluetooth.te
+++ b/public/hal_bluetooth.te
@@ -3,7 +3,7 @@
 binder_call(hal_bluetooth_server, hal_bluetooth_client)
 
 add_hwservice(hal_bluetooth_server, hal_bluetooth_hwservice)
-allow hal_bluetooth_client hal_bluetooth_hwservice:hwservice_manager find;
+hal_attribute_hwservice_client(hal_bluetooth, hal_bluetooth_hwservice)
 
 wakelock_use(hal_bluetooth);