Fixing incorrect initial states for panels

- Apply more attrs after reset the panel
- Move some helper function to panel itself.

Flag: com.android.systemui.car.scalable_ui
Bug: 409272467
Test: atest com.android.systemui.car.wm.scalableui
Change-Id: I4160e6dfc51e8b37144aba1137777acd4bd11c20
9 files changed