Initialize ieee1394 early when built in

This makes debugging with firescope easier.

Signed-off-by: Andi Kleen <ak@suse.de> (original patch)

Update:
 - no need for #ifdef MODULE
 - add comment in ieee1394_core, more verbose comment in ohci1394

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (update)