Move standard macro definitions for the zone types and zone conditions
to scsi_proto.h together with the definitions related to the REPORT
ZONES command. While at it, define all values in the enums to be clear.

Also remove unnecessary includes in sd_zbc.c.

No functional change is introduced by this patch.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>