[SCSI] fix up SCSI netlink build

CONFIG_SCSI_NETLINK can become a bool since the item its
selecting (CONFIG_NET) cannot be a module.
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/Kconfig

@@ -28,7 +28,7 @@ config SCSI
 	  (the one containing the directory /) is located on a SCSI device.
 
 config SCSI_NETLINK
-	tristate
+	bool
 	default	n
 	select NET