Prevent extreme prob when count is small
Prevent extreme prob when count is small

Add function get_binary_prob_new in aom_entropy_optimizer.c.
This function add "+1" to both 0 and 1 counters such that it won't
generate extreme probability when both counters are small

Change-Id: I759d6e1cfedaf1c36281b523c26e7a7d1cad147c

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