Add SSE2 versions of av1_fht8x16 and av1_fht16x8
Encoder speedup ~2% with ext-tx + rect-tx Change-Id: Id56ddf102a887de31d181bde6d8ef8c4f03da945
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Encoder speedup ~2% with ext-tx + rect-tx Change-Id: Id56ddf102a887de31d181bde6d8ef8c4f03da945