Don't use hybrid transform (ADST) for superblocks.
Don't use hybrid transform (ADST) for superblocks.

This is in line with other cases where we disable ADST if prediction
size and transform size don't match. Before this patch, the RD loop
will use ADST for superblocks, but frame encoding/decoding won't.

Change-Id: I700368c632eb72b5e089c22ef25649d99d7697d0

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