scsi: sd: Warn if unsupported ZBC device is probed

In sd_probe(), print a warning if CONFIG_BLK_DEV_ZONED is disabled and a
TYPE_ZBC device is found. While at it, use IS_ENABLED() to test if
CONFIG_BLK_DEV_ZONED is enabled instead using of a #ifdef.

Link: https://lore.kernel.org/r/20210128055658.530133-1-damien.lemoal@wdc.com


Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>