Revert "SF: Fix hwrotation screenshots at surfaceflinger layer"

* This reverts commit 8c36832b, because
  "fixing" screenshots in DisplayDevice.cpp actually works by rotating the
  DisplaySurface in the opposite direction by the same ro.sf.hwrotation
  angle. This introduces 2 regressions:
    - ro.sf.hwrotation now needs to be set to 270 whereas the same
      hardware needed 90 prior to this patch.
    - Activity preview thumbnails (in the recents menu) are no longer
      displayed correctly. The activities which were started in portrait
      mode now have 90-degree-rotated thumbnails, and the activities
      which were started in landscape mode now have
      vertically-stretched-to-half thumbnails.

Change-Id: I779e3979df8cdcc3dd9775221d337c02f918bc00