[SCSI] add 6.0 Gbit phy definitions to the sas transport class

I don't think these exist in silicon yet, but the aic94xx driver has a
register setting for them.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/include/scsi/scsi_transport_sas.h b/include/scsi/scsi_transport_sas.h
index ccef5d2..95e2132 100644
--- a/include/scsi/scsi_transport_sas.h
+++ b/include/scsi/scsi_transport_sas.h
@@ -30,6 +30,7 @@
 	SAS_SATA_PORT_SELECTOR,
 	SAS_LINK_RATE_1_5_GBPS,
 	SAS_LINK_RATE_3_0_GBPS,
+	SAS_LINK_RATE_6_0_GBPS,
 	SAS_LINK_VIRTUAL,
 };