[SCSI] scsi/ibmvscsi/srp.h: Fix a wrong type code used for SRP_LOGIN_REJ

This patch fixes srp.h which uses 0x80 for SRP_LOGIN_REJ instead of
0xc2.

Signed-off-by: Linda Xie <lxie@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>