s390/topology: reduce number of printks

Merge the seven printks within topology_init_early to a single one.
With an early boot console this avoids printing six lines each
containing only a single character.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>