OpenOCD support for DE2-115

[schoeberl]

It's not a real issue, but it would be nice if we could configure the Altera board with OpenOCD. I managed to do this for a Xiliknx board on my Mac with Apple silicon. But I failed with the DE2-115. Anyone with a Linux box could give it a try.

OpenOCD needs a .svf file, which can be generated as follows:

cd quartus/$(QPROJ) && quartus_cpf -c -q 25MHz -g 3.3 --operation p output_files/abc.sof output_files/abc.svf