Add initial support for Symbiflow toolchain for Xilinx 7-series #334
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The PR adds initial support for Symbiflow for XC7 devices. To use Symbiflow instead of Vivado, a platform should inherit
Xilinx7SeriesSymbiflowPlatform
instead ofXilinx7SeriesPlatform
.The example used below is a copy of arty_a7.py from nmigen-boards, where in addition to changing the base class, the device (part) name has also been changed (original part is not present in prjxray/symbiflow database).
Test: