Allow traced_probes to access power rail data.

Allows power rail data to be logged in the trace, allowing
high fidelity attribution of battery power use.

Matching feature CL: aosp/891533

SELinux denials that lead to this:
avc: denied { call } for scontext=u:r:traced_probes:s0 tcontext=u:r:hal_power_stats_default:s0 tclass=binder

Test: checked data in a trace
Bug: 122584217

Change-Id: I7e0f4e825be3f54bc78d91da1cb85c2f61465a44
diff --git a/private/traced_probes.te b/private/traced_probes.te
index 8aa475e..689ff5c 100644
--- a/private/traced_probes.te
+++ b/private/traced_probes.te
@@ -66,8 +66,9 @@
   proc_stat
 }:file r_file_perms;
 
-# Allow access to the IHealth HAL service for tracing battery counters.
+# Allow access to the IHealth and IPowerStats HAL service for tracing battery counters.
 hal_client_domain(traced_probes, hal_health)
+hal_client_domain(traced_probes, hal_power_stats)
 
 # On debug builds allow to ingest system logs into the trace.
 userdebug_or_eng(`read_logd(traced_probes)')