Support sub8x8 chroma component prediction
This commit allows the sub8x8 blocks to compose and filter their chroma components for supertx in cb4x4 mode. The coding gains of supertx and cb4x4 are largely additive: supertx cb4x4 cb4x4 + supertx lowres -1.0% -2.7% -3.64% midres -0.8% -1.3% -2.10% Change-Id: Ie7d09f6fceb36ce375e56773728f05dd628786fe
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