s390/sclp: avoid copy of sclp_info_sccb

For extended sccb support, sccb size could be up to 3 pages. Hence avoid
copy of sclp_info_sccb.

Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>