Revert "msm: mdss: handle get buffer failure gracefully"

 * It's possible in the split rotator case for the rotator to
   get queued with has_buf = 0, which results in solidfill being
   enabled on the pipe. This is leads to IOMMU page faults and
   writeback timeouts.
 * Fixes green screen when rotating video on dual-DSI, and 4K
   video rotation on single-DSI (split rotator).

This reverts commit e092ab6793d4c718a37da38f79bb9d79c92c22c8.

Change-Id: I6cd57bba4be77242c2e314a5c0452eae1f10b104