Rework av1_has_right() and av1_has_bottom()
Rework av1_has_right() and av1_has_bottom()

Replace the 4x4 block counting with minimum transform block size
counting. This retains identical coding statistics.

Change-Id: I13ce6b5b62641304b0ff1c6efd34c6a590195792

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