scsi: MAINTAINERS: Remove intel-linux-scu@intel.com for INTEL C600 SAS DRIVER

The mail address intel-linux-scu@intel.com bounces. Remove it.

Link: https://lore.kernel.org/r/1610449890-198089-1-git-send-email-john.garry@huawei.com
Cc: Ahmed S. Darwish <a.darwish@linutronix.de>
Cc: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Acked-by: Ahmed S. Darwish <a.darwish@linutronix.de>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>