vhost-scsi: Include prot_bytes into expected data transfer length

vhost-scsi: Include prot_bytes into expected data transfer length

This patch updates vhost_scsi_get_tag() to accept the combined
expected data transfer length + T10 PI bytes as the value passed
into target_submit_cmd().

This is required now that target-core logic in commit 14ef9200
expects to subtract se_cmd->prot_length from se_cmd->data_length.

Cc: Paolo Bonzini <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Martin K. Petersen <[email protected]>
Cc: Sagi Grimberg <[email protected]>
Signed-off-by: Nicholas Bellinger <[email protected]>