Revert removal of power hint from PowerManager.aidl

Reverts all changes on PowerManagerService.cpp and bring back power hint
methods and usages.

Bug: b/157483189
Test: builds
Change-Id: I52bb144d646646fecce73a24882d20226d319026
diff --git a/bridge/src/com/android/layoutlib/bridge/android/BridgePowerManager.java b/bridge/src/com/android/layoutlib/bridge/android/BridgePowerManager.java
index 0e78ef9..6a77a8e 100644
--- a/bridge/src/com/android/layoutlib/bridge/android/BridgePowerManager.java
+++ b/bridge/src/com/android/layoutlib/bridge/android/BridgePowerManager.java
@@ -96,6 +96,11 @@
     }
 
     @Override
+    public void powerHint(int hintId, int data) {
+        // pass for now.
+    }
+
+    @Override
     public void setPowerBoost(int boost, int durationMs) {
         // pass for now.
     }