Make tx_type speed feature default

Revisit the compression performance and complexity trade-off after
making the SIMD version of trellis optimizations. Before that,
reduce the transform-quantization function calls temporarily. This
would cause about 0.3% performance drop for lowres set.

Change-Id: I16917a6bd5c44ec6cd8cd0b59f3c336c4fd96dd2
1 file changed