[fft_core] Increased multiplier latency by 1 (from 3 to 4).

This is in an effort to help sma_corr to meet timing.
[fft_core] Changed FFT oflow size from 32 to 4 bits.

For some reason the width of this signal changed again, this time to
4 bits. I had to modify fft_core_config and update sma_corr to get this
change to propagate properly.
[fft_core] Decrease latency of multipliers by 1, from 4 back to 3.

This is basically undoing the change in sma-wideband/design_files@606d516
and resynthesizing the blackbox netlist.

Netlist built with sma-wideband/mlib_devel@72d879c
[fir_core] Recompiled with the latest version of mlib_devel.

Netlist built with sma-wideband/mlib_devel@72d879c