Revert "msm: mdss: Enable overfetch unconditionally"

This reverts commit 0c2915e6a0c034e37dd6c983a9b80add5748b9a8.
It fixed the time green line but broke neflix video playback.

Change-Id: I39c5f992ed42256c7bfc0d6fba7f959bd26c2c4e