package/mdio-tools: enable CONFIG_NETDEVICES

mdio-tools depends on CONFIG_MDIO_DEVICE in order for mdiobus driver to
be built, but CONFIG_MDIO_DEVICE depends on CONFIG_NETDEVICES which we
are not enabling so on platforms without it enabled in kernel config
building mdio-tools will fail with:

ERROR: modpost: "mdio_find_bus" [output-1/build/mdio-tools-1.3.1/kernel/mdio-netlink.ko] undefined!
ERROR: modpost: "__mdiobus_c45_read" [output-1/build/mdio-tools-1.3.1/kernel/mdio-netlink.ko] undefined!
ERROR: modpost: "__mdiobus_read" [output-1/build/mdio-tools-1.3.1/kernel/mdio-netlink.ko] undefined!
ERROR: modpost: "__mdiobus_c45_write" [output-1/build/mdio-tools-1.3.1/kernel/mdio-netlink.ko] undefined!
ERROR: modpost: "__mdiobus_write" [output-1/build/mdio-tools-1.3.1/kernel/mdio-netlink.ko] undefined!

So enable CONFIG_NETDEVICES as well to make sure CONFIG_MDIO_DEVICE can be enabled.

Fixes: http://autobuild.buildroot.net/results/edf47df96cde6094c890c0b74034cced90335a39/

Signed-off-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit b95fff0185803bac5c8cfb558d60234e59a1469b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mdio-tools/mdio-tools.mk

@@ -14,6 +14,7 @@ MDIO_TOOLS_MODULE_SUBDIRS = kernel
 
 define MDIO_TOOLS_LINUX_CONFIG_FIXUPS
 	$(call KCONFIG_ENABLE_OPT,CONFIG_NET)
+	$(call KCONFIG_ENABLE_OPT,CONFIG_NETDEVICES)
 	$(call KCONFIG_ENABLE_OPT,CONFIG_MDIO_DEVICE)
 endef