feat: enable iscsi modules

This enables scsi_transport_iscsi, and iscsi_tcp modules.

Signed-off-by: Andrew Rynhard <andrew@andrewrynhard.com>

kernel/config-amd64

@@ -1959,14 +1959,14 @@ CONFIG_SCSI_CONSTANTS=y
 #
 CONFIG_SCSI_SPI_ATTRS=y
 # CONFIG_SCSI_FC_ATTRS is not set
-# CONFIG_SCSI_ISCSI_ATTRS is not set
+CONFIG_SCSI_ISCSI_ATTRS=y
 CONFIG_SCSI_SAS_ATTRS=y
 # CONFIG_SCSI_SAS_LIBSAS is not set
 # CONFIG_SCSI_SRP_ATTRS is not set
 # end of SCSI Transports
 
 CONFIG_SCSI_LOWLEVEL=y
-# CONFIG_ISCSI_TCP is not set
+CONFIG_ISCSI_TCP=y
 # CONFIG_ISCSI_BOOT_SYSFS is not set
 # CONFIG_SCSI_CXGB3_ISCSI is not set
 # CONFIG_SCSI_CXGB4_ISCSI is not set