Revert "Use HWC_NUM_DISPLY_TYPES for 1.3 as number of displays"

This reverts commit a6c564e51955f4a238e83ff4fb53c7f19a43cf5c, because it
got fixed upstream: http://review.cyanogenmod.org/#/c/67489/
Merge pull request #24 from sledges/revert-morphis

tearing fixed in cm nightly, reverting relevant morphis' commit