bitnet: remove iq1_bn lookup table storing +/- signs

The AVX2 implementation was the only one left using it, so
I decided to see if we can get a performant implementation
using the 0,1,2 lookup table. Turns out we can, and it is
even slightly faster than the sign based table. We now
get PP-512 = 275 t/s and TG-128 = 57.7 t/s with 16 threads
on the Ryzen-7950X.

With only one lookup table left for iq1_bn, I renamed it to
iq1bn_grid_u16.

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