panic in dummy apic handlers
panic in dummy apic handlers

- as panic can do the same as printf now, let's rather panic when a
  dummy apic interrupt vector handler is hit

veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi