When int_pro_motion_estimation is done for superblock in
choose_partitioning, use it to avoid the full_pixel_search
for NEWMV mode, if bsize is >= 32X32.

For speed > 7.
Small/neutral change on RTC metrics.
~1-2% speedup on arm on high motion clip.

Change-Id: I3cfe6833ff4bf75d4afa83eaf058ad45729de85b