Add power.stats HAL 1.0 sepolicy

Also giving statsd permission to access it. This change copies the internal sepolicy to AOSP.

Bug: 111185513
Bug: 120551881
Test: make
Change-Id: I7e0386777e05580299caf9b97cb7804459f1a9d0
diff --git a/private/system_server.te b/private/system_server.te
index 3806d23..ed864f5 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -216,6 +216,7 @@
 hal_client_domain(system_server, hal_oemlock)
 hal_client_domain(system_server, hal_omx)
 hal_client_domain(system_server, hal_power)
+hal_client_domain(system_server, hal_power_stats)
 hal_client_domain(system_server, hal_sensors)
 hal_client_domain(system_server, hal_system_suspend)
 hal_client_domain(system_server, hal_tetheroffload)