Display: Initialize mRotation to panel orientation.

    - Fixes the homescreen layout to be prepared based on the panel
      orientation.
    - Disables the rotation animation from 0 to panel orientation after
      bootup.

Conflicts:
    core/java/com/android/internal/view/RotationPolicy.java

Change-Id: Ie77e53ade087df05e102c45bf9d12bdaf09583f7