omap4-common: Disable scissor optimization

Reference: http://source.android.com/devices/tuning.html
https://android.googlesource.com/device/samsung/tuna/+/fd63d70c864a1196738ab081bfd063c93081e77a

Change-Id: I18634fce31e7c761d3f4bb9ac541ed4ffdb247d0