gowin: dsp: Add basic DSP block inferencing for various MULT cells #5411
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Add basic MULT cell inferencing to gowin backend for gw1n and gw2a families.
It would be helpful if someone could verify this properly on real FPGA as well (haven't yet figured out how to properly build a real life "test" for it..).
This was motivated by missing MULT18X18 support for gw2a family which was discovered when attempting to synthesize this project: https://github.com/ryomuk/TangNanoDCJ11MEM/tree/main/hdl/unix
Tests have been added, but need some scrutiny.. ;)