tearing fixed in cm nightly, reverting relevant morphis' commit

@siteshwar's patch accepted by CM: http://review.cyanogenmod.org/#/c/67489/
Landed in nightly: http://mirror.slc.cyanogenmod.org/jenkins/77012/cm-11-20140723-NIGHTLY-hammerhead.zip
This qpa-hwc has been tested - no tearing encountered with cm above