[SCSI] qla2xxx: Remove support for reading/writing HW-event-log.

Software should not touch this region of flash, as the firmware
will be the only writer and consumer of the region.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>