Fix the blinking while tapping chart to select time intervals.
- setHasStableIds(true) to avoid BatteryChartView create viewHolder again when SettingsPreferenceGroupAdapter invoke notifyDataSetChanged()
Recover the fade-in animation when display the hourly chart for the first time.
- set the default alpha of hourly chart in xml to 0.
Bug: 378997970
Bug: 349652542
Flag: EXEMPT bug fix
Test: visual
Change-Id: Ia6c131452fca65db7149664c7e18ca68e9703def
c369a8df5a