kernel: iscsi-initator: fix kernel config symbols

Enable SCSI low-level drivers on targets that don't have it already in
order to fix following build failures on few platforms:

  .config:4739:warning: symbol value 'm' invalid for SCSI_LOWLEVEL
 * Restart config...
 * SCSI low-level drivers
 SCSI low-level drivers (SCSI_LOWLEVEL) [Y/n] (NEW) aborted!

Fixes: b88f8202c4 ("kernel: add iscsi-initator support")
Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>
[commit subject and description facelift]
Signed-off-by: Petr Štetiar <ynezz@true.cz>

package/kernel/linux/modules/block.mk

@@ -276,9 +276,9 @@ define KernelPackage/iscsi-initiator
   DEPENDS:=+kmod-scsi-core +kmod-crypto-hash
   KCONFIG:= \
 	CONFIG_INET \
-	CONFIG_SCSI_LOWLEVEL \
+	CONFIG_SCSI_LOWLEVEL=y \
 	CONFIG_ISCSI_TCP \
-	CONFIG_SCSI_ISCSI_ATTRS
+	CONFIG_SCSI_ISCSI_ATTRS=y
   FILES:= \
 	$(LINUX_DIR)/drivers/scsi/iscsi_tcp.ko \
 	$(LINUX_DIR)/drivers/scsi/libiscsi.ko \