s390: Update defconfigs which were missing CONFIG_NET.

Commit df568d8e ("scsi: Use 'depends' with LIBFC instead of
'select'.")  removed what happened to be the only instance of 'select
NET'. Defconfigs that were relying on the select now lack networking
support.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc arch/s390/configs/default_defconfig
Simple merge

diff --cc arch/s390/configs/gcov_defconfig
Simple merge

diff --cc arch/s390/configs/performance_defconfig
Simple merge

diff --cc arch/s390/configs/zfcpdump_defconfig
Simple merge

diff --cc arch/s390/defconfig
Simple merge