healthd: Add hooks for ENERGY_COUNTER property

Bug: 10118565
Change-Id: Ibabae2a78a600ae37ce9b91da0f5980ee94b05c2
diff --git a/healthd/healthd.cpp b/healthd/healthd.cpp
index 5fe2965..a1912f1 100644
--- a/healthd/healthd.cpp
+++ b/healthd/healthd.cpp
@@ -52,6 +52,7 @@
     .batteryCurrentNowPath = String8(String8::kEmptyString),
     .batteryCurrentAvgPath = String8(String8::kEmptyString),
     .batteryChargeCounterPath = String8(String8::kEmptyString),
+    .energyCounter = NULL,
 };
 
 static int eventct;