bifrost/asm: Fix port0/port1 R32-R63 twiddling
This could never work as-is, since the decoding algorithm as implemented in SPD has the property that after decoding, port1 > port0 always. If port0 > port1 initially, then the decoder will compute the final port0 as 63 - port0 and port1 as 63 - port1, making the final port1 larger than port0. The new encoding algorithm here is the one that I had in mind initially after RE'ing this.
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