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s390/configs: Enable BLK_DEV_NULL_BLK as module
Enable BLK_DEV_NULL_BLK as module in defconfig and debug_defconfig, so the Null Test Block Device Driver can be easily used for testing purposes. Signed-off-by:Halil Pasic <pasic@linux.ibm.com> Signed-off-by:
Heiko Carstens <hca@linux.ibm.com>