Enable cpp support for IPowerStats AIDL interface

Bug: 178219601
Test: build
Change-Id: If29ff4760da866e91471874e17c1288be7877e27
diff --git a/power/stats/aidl/Android.bp b/power/stats/aidl/Android.bp
index f4955e2..454c69a 100644
--- a/power/stats/aidl/Android.bp
+++ b/power/stats/aidl/Android.bp
@@ -38,7 +38,7 @@
             },
         },
         cpp: {
-            enabled: false,
+            enabled: true,
         },
     },
 }