Increase size of BatteryStatsService stats buffer

BatteryStatsService stats buffer needs to be expanded to fit more power stats.

Bug: 117175936
Test: adb bugreport
Change-Id: I8c790cd4202258acc6602586a40916359be7681f
diff --git a/services/core/java/com/android/server/am/BatteryStatsService.java b/services/core/java/com/android/server/am/BatteryStatsService.java
index e2b59b4..c2f4529 100644
--- a/services/core/java/com/android/server/am/BatteryStatsService.java
+++ b/services/core/java/com/android/server/am/BatteryStatsService.java
@@ -108,7 +108,7 @@
                     .replaceWith("?");
     private ByteBuffer mUtf8BufferStat = ByteBuffer.allocateDirect(MAX_LOW_POWER_STATS_SIZE);
     private CharBuffer mUtf16BufferStat = CharBuffer.allocate(MAX_LOW_POWER_STATS_SIZE);
-    private static final int MAX_LOW_POWER_STATS_SIZE = 2048;
+    private static final int MAX_LOW_POWER_STATS_SIZE = 4096;
 
     /**
      * Replaces the information in the given rpmStats with up-to-date information.