Rename power_stat_hal to power_stats

This is a simple file rename to allow to make subsequent review easier.

Bug: 182927513
Change-Id: Ia6c3f07a427c23e79877a75c3201b518c659b44b
diff --git a/BUILD b/BUILD
index 3b09ac8..9a6cd9e 100644
--- a/BUILD
+++ b/BUILD
@@ -551,8 +551,8 @@
         "src/android_internal/atrace_hal.h",
         "src/android_internal/health_hal.h",
         "src/android_internal/incident_service.h",
+        "src/android_internal/power_stats.h",
         "src/android_internal/power_stats_aidl.h",
-        "src/android_internal/power_stats_hal.h",
         "src/android_internal/statsd_logging.h",
         "src/android_internal/tracing_service_proxy.h",
     ],