net: fix IBM EMAC driver after rename.

In commit 9aa3283595451ca093500ff0977b106e1f465586 (ehea/ibm*: Move the
IBM drivers) the IBM_NEW_EMAC* were renames to IBM_EMAC*

The conversion was incomplete so that even if the driver was added to
the .config it wasn't built, but there were no errors).  In this commit
we also update the various defconfigs that use EMAC to use the new
Kconfig symbol, and explicitly add the NET_VENDOR_IBM guard.

We do not explicitly select the Kconfig dependencies, as this would force
EMAC on.  Doing it in the defconfig allows more flexibility.

Tested on a canyondlands board.

Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/ibm/emac/rgmii.h b/drivers/net/ethernet/ibm/emac/rgmii.h
index d697990..9296b6c 100644
--- a/drivers/net/ethernet/ibm/emac/rgmii.h
+++ b/drivers/net/ethernet/ibm/emac/rgmii.h
@@ -54,7 +54,7 @@
 	struct platform_device		*ofdev;
 };
 
-#ifdef CONFIG_IBM_NEW_EMAC_RGMII
+#ifdef CONFIG_IBM_EMAC_RGMII
 
 extern int rgmii_init(void);
 extern void rgmii_exit(void);
@@ -77,6 +77,6 @@
 # define rgmii_set_speed(x,y,z)	do { } while(0)
 # define rgmii_get_regs_len(x)	0
 # define rgmii_dump_regs(x,buf)	(buf)
-#endif				/* !CONFIG_IBM_NEW_EMAC_RGMII */
+#endif				/* !CONFIG_IBM_EMAC_RGMII */
 
 #endif /* __IBM_NEWEMAC_RGMII_H */