msm: mdss: disable overfetch done while scaling

While programming pipe, src image size can be programmed when area
outside crop rectangle contains valid contents in order to allow MDP hw
to do overfetch of pixels while scaling. However for most cases in video
playback the area outside the crop rectangle is only padding with
invalid pixels used in order to satisfy alignment requirements. Since
driver is not aware if padding is being used or not, disable the over
fetching along the border to avoid unexpected pixels being displayed.

CRs-Fixed: 404918
Change-Id: I145f34bcaef76a88116b6803eeaf4a5ffd19592d
Signed-off-by: Adrian Salido-Moreno <adrianm@codeaurora.org>