[RFC]pass pm related information from ata to scsi

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Hi,

ATA ODD has a new feature called device attention, which means it can
notify sata host that it needs power when in powered off state.

In libata, we can set a flag(ATA_DFLAG_DA) to represent this when
identifying the ata device. And when we are going to create the scsi
device(in ata_scsi_scan_host by __scsi_add_device), I hope the scsi
driver(sr) knows that this ODD supports device attention in its probe
function(sr_probe).

I didn't find a proper way to do this, any suggestions?
Thanks.

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