litex/build/lattice/diamond, platform: allows users to add custom sdc files #2113
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With the current diamond support all timings constraints are written into .lpf
This mean it's no possible to assign constraints to internal OSC or PLL outputs.
As a Workaround this PR allows users to provides one or more sdc files to integrate to the project.
Future work is to integrate sdc generation as done for radiant.