utils: Use unidir routing in template.
utils: Use unidir routing in template.

`bidir` stuff is a lot less tested in vpr. See
https://github.com/verilog-to-routing/vtr-verilog-to-routing/issues/277

Signed-off-by: Tim 'mithro' Ansell <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@mith.ro>

SymbiFlow/symbiflow-arch-defs,SymbiFlow/symbiflow-arch-defs