[rtl] relocate TWI tri-state drivers #386
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This PR relocates the TWI tri-state drivers from the TWI module to the NEORV32 top entity (one level to the top).
Maybe the tri-state drivers should be excluded from the processor so that they have to be implemented in the design's top entity... 🤔 Some synthesis tools seem to have problems if tri-state drivers are "buried" somewhere inside the design (looking at you Vivado)...