scsi: sd: Remove the number of forward declarations

Move the sd_pm_ops and sd_template data structures to just above init_sd()
such that the number of forward function declarations can be reduced.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230823210628.523244-1-bvanassche@acm.org


Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>