net: bcmgenet: Add dependency on HAS_IOMEM && OF

The driver needs CONFIG_HAS_IOMEM and OF to be functional, but we still
let it build with COMPILE_TEST. This fixes the unmet dependency after
selecting MDIO_BCM_UNIMAC in commit mentioned below:

warning: (NET_DSA_BCM_SF2 && BCMGENET) selects MDIO_BCM_UNIMAC which has
unmet direct dependencies (NETDEVICES && MDIO_DEVICE && HAS_IOMEM &&
OF_MDIO)

Fixes: 9a4e796 ("net: bcmgenet: utilize generic Broadcom UniMAC MDIO controller driver")
Signed-off-by: Florian Fainelli <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: ffainelli

drivers/net/ethernet/broadcom/Kconfig

@@ -61,6 +61,7 @@ config BCM63XX_ENET
 
 config BCMGENET
 	tristate "Broadcom GENET internal MAC support"
+	depends on (OF && HAS_IOMEM) || COMPILE_TEST
 	select MII
 	select PHYLIB
 	select FIXED_PHY