drm/msm/sde: reclaim buffers for inline rotation res change

Move the check for reallocating the intermediate buffer for
inline rotation to the atomic check phase. This allows the
buffer reclaim logic to correctly clean up any freed buffers
so that a new buffer can be created during the prepare.

Change-Id: I9d3c8bdbaa3054717f6be83cd56c305c63cc734d
Signed-off-by: Clarence Ip <cip@codeaurora.org>