MAINTAINERS: remove pmchba list for PM8001

The email address is undeliverable for some time now, so just remove it.
Signed-off-by: NJack Wang <jinpu.wang@profitbricks.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

MAINTAINERS

@@ -9975,7 +9975,6 @@ F:	drivers/scsi/pmcraid.*
 PMC SIERRA PM8001 DRIVER
 M:	Jack Wang <jinpu.wang@profitbricks.com>
 M:	lindar_liu@usish.com
-L:	pmchba@pmcs.com
 L:	linux-scsi@vger.kernel.org
 S:	Supported
 F:	drivers/scsi/pm8001/