Free up all the allocated mem space in cb4x4
Free up all the allocated mem space in cb4x4

Use the right number to free up the allocated memory space in
context space.

Change-Id: Ic2950c133d6234b9a4216283a6f4a1dea13128d1

GrokImageCompression/aom,luctrudeau/aom,luctrudeau/aom,luctrudeau/aom,smarter/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,luctrudeau/aom,GrokImageCompression/aom,smarter/aom,GrokImageCompression/aom,smarter/aom,luctrudeau/aom,GrokImageCompression/aom,luctrudeau/aom,smarter/aom,smarter/aom