Turn on tx_type search when sb_type < BLOCK_8X8
Turn on tx_type search when sb_type < BLOCK_8X8

Change-Id: I8d9686c36ebf7057c4432bb5a29ade78dc21d0a7

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