Fix port list in top_artya7 example
Fix port list in top_artya7 example

The "alert_major" port was split into "internal" and "bus" parts back
in commit 9943f9a. Update the example to match.

lowRISC/ibex,lowRISC/ibex,AmbiML/ibex,AmbiML/ibex,AmbiML/ibex,lowRISC/ibex,lowRISC/ibex,AmbiML/ibex