scsi: isci: Make most module parameters static

Most of the module parameters are only used locally in the same C file; so
static them.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://lore.kernel.org/r/20250309145044.38586-1-linux@treblig.org


Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>