Symbiflow-classroom: Array Initializers Do Not Work

SYMBIFLOW-CLASSROOM-PROJECT

Using original Yosys frontend.

If SV code contains a legal array declaration and initialization like this:
```
// Lookup table for % 3 calculation.
logic[1:0] modmem[8] = '{0, 1, 2, 0, 1, 2, 0, 1};
```
a syntax error results. Arrays cannot be initialized this way with the tools (but it is legal SV and works with other tools).

Start by reproducing the SystemVerilog array initializer with the original Yosys frontend, using the example in the issue. Trace where the legal declaration and initialization is rejected; done means this form is accepted without a syntax error and existing relevant checks still pass.

Written by the indexing model from the issue text.