Remove skip_txfm optimization.
Commit 0d6980d7 removed some use of the skip_txfm optimization, and the rest are not productive. The current use of this optimization is only used with --good and --cpu-used >= 3, however the overhead of this is higher than the speedup it yields. Removing this, and subsequently simplifying model_rd_for_sb yields a net encoder speedup: --cpu-used=0 ~1.5% faster --cpu-used=3 ~2.0% faster The code simplification is also significant. Change-Id: I1dd668c32de15a2e912c59c42379d0f9e1032ff8
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