Reduce div_mult size from 64 to 32
Reduce div_mult size from 64 to 32

In the final spec, the maximum value needed here is 31. Drop the
rest table content.

Change-Id: I21d90447cbefed256693985373c5837d5e1728db

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