scsi: pm8001: Remove PM8001_READ_VPD

Remove the macro PM8001_READ_VPD used to define if a controller WWN should
be retrieved from the device. Instead, define the better named boolean
module parameter "read_wwn" to control this.

The code to set a fixed address for a phy device address when read_wwn is
set to false is simplified and fixed to avoid sparse warnings.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20230911232745.325149-11-dlemoal@kernel.org


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