sfc: Expose flash region storing boot code as MTD

The boot code that appears as a PCI expansion ROM on the SFC4000 is
stored in flash.  Expose this as a standard MTD device to allow for
in-place upgrades.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/net/sfc/Makefile b/drivers/net/sfc/Makefile
index c8f5704..e507daa 100644
--- a/drivers/net/sfc/Makefile
+++ b/drivers/net/sfc/Makefile
@@ -1,5 +1,6 @@
 sfc-y			+= efx.o falcon.o tx.o rx.o falcon_xmac.o \
 			   selftest.o ethtool.o xfp_phy.o \
 			   mdio_10g.o tenxpress.o boards.o sfe4001.o
+sfc-$(CONFIG_SFC_MTD)	+= mtd.o
 
 obj-$(CONFIG_SFC)	+= sfc.o