Reduce transform set for intra for 8x8 and smalller to 7 from 12.
Also fixes an issue with prob updates.

Enocder Speed-up about 8-10%

Coding efficiency very little change.
lowres: -2.996 (from -3.055 before)
midres: -2.482 (from -2.552 before)

Change-Id: I4ba50ff967521b33c748fe423bd92f7cf4105ebc