Use CounterRotator for wallpaper animation targets when unlocking

To avoid seeing the portrait wallpaper being placed on the Landscape
display bounds without fiting the screen when unlocking keyguard
in phone devices from Portrait to Landscape mode,

Using CounterRotator to ensure the closing wallpaper orientation
unchanged during transition animation for fixing this flicker case.

See: http://recall/-/bN53iXCwu0DIehsmJlTyWk/craq03f8iJXcaFXGWR8mBM

Bug: 283963801
Test: atest WMShellFlickerTests:UnlockKeyguardToSplitScreen \
         --rerun-until failure 10
Test: manual by issue steps:
  1) Launch apps to enter split-screen mode
  2) Turn off/on the screen with power key to show the lockscreen
  3) Rotate the device in landscape
  4) Swipe up to dismiss the lockscreen
  5) Expect the split-tasks animates fade-in without seeing a weird
     cross-fade out animation on top of the split-tasks
Change-Id: I50550fd2a7fc488d743794fb1044dfe9d126521a