Handle early exit for skip case
Handle early exit for skip case

During txfm_search early exit handled appropriately for skip case.

When tested for 20 frames of BasketBallDrill_832x480_50 at 1 mbps,
observed ~0.29% reduction in encoder time for speed=1 preset.

As per AWCY runs 0.01% BD-rate improvement is seen
for speed=1 preset.

STATS_CHANGED

Change-Id: If6d678637b9b29a3d70d17573138af2b064d05ba

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom