Fix time zone info in kernel is nothing after reboot

If sys_tz is not set correctly, the timestamp of
filesystem will be in-consistent with android's time,
until time zone is set from android's UI. Set kernel
timezone while initializing AlarmManagerService.

Change-Id: Ic85def954fc9388e943e3dee45767d8179825a49

Author: Robert CH Chou

services/java/com/android/server/AlarmManagerService.java

@@ -122,6 +122,14 @@ private static final class BroadcastStats {
     public AlarmManagerService(Context context) {
         mContext = context;
         mDescriptor = init();
+
+        // We have to set current TimeZone info to kernel
+        // because kernel doesn't keep this after reboot
+        String tz = SystemProperties.get(TIMEZONE_PROPERTY);
+        if (tz != null) {
+            setTimeZone(tz);
+        }
+
         PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
         mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);