Fix attach messages format for the pcibus.
Fix attach messages format for the pcibus.

Before:
pcibus0 at iobus0 irq 0pci0 at pcibus0 bus 0

After:
pcibus0 at iobus0 irq 0
pci0 at pcibus0 bus 0

Found on my DSR-500. Okay miod@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars