sfc: Use kernel I2C system and i2c-algo-bit driver

Remove our own implementation of I2C bit-banging.

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 1d2daee..c8f5704 100644
--- a/drivers/net/sfc/Makefile
+++ b/drivers/net/sfc/Makefile
@@ -1,5 +1,5 @@
 sfc-y			+= efx.o falcon.o tx.o rx.o falcon_xmac.o \
-			   i2c-direct.o selftest.o ethtool.o xfp_phy.o \
+			   selftest.o ethtool.o xfp_phy.o \
 			   mdio_10g.o tenxpress.o boards.o sfe4001.o
 
 obj-$(CONFIG_SFC)	+= sfc.o