Init the pref summary in onCreate()

The visibility of bottom summary in BatteryHistoryPrefence will
be changed dynamically(charging status + flags). Before this cl,
we only update it in a callback, which makes other preference
may have unnecessary moves.

This cl add init method in onCreate(), which removes the uncessary
preference position moves.

Bug: 65529494
Test: RoboTest still pass
Change-Id: I09d2e26fc3caaeb272422997c16957770cdc1d3f