drm/nouveau/bios: fix INDEX_ADDRESS_LATCHED trace printout

Having a \n in the middle of a format string means that the next line
doesn't get the prefixes unlike every other line printed by the trace.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>