cb4x4: Move sub-4X4 block sizes behind chroma flags.
cb4x4 itself should not require these sizes. This simplifies compatibility with other experiments, since we can first make them work with cb4x4 (which is now on by default), and then worry about chroma_sub8x8 and chroma_2x2 (which is not) in separate steps. Encoder and decoder output should remain unchanged. Change-Id: Iff2a5494cab3b7d96f881e8bd9cd4bf18c817cfa