The feature undergoes prior assumption that the recursive partition
size search from 4x4 to 64x64, hence utilizing information from small
blocks to determine early termination in large block rate-distortion
optimization search. The current codebase is now going from top down.
The previous function might go with not properly initialized values,
hence removed.

Tested on pedestrian_area_1080p at 4000 kbps running under speed 2.
No visible difference in runtime observed.

Change-Id: I553df415c6191413762db7ae34e8790c71d8118e