kernel: Make kmod-ixgbe depend on kmod-libphy

With kernel 5.4 kmod-ixgbe is depending on kmod-libphy, add this
missing dependency.

Signed-off-by: Hauke Mehrtens <[email protected]>

package/kernel/linux/modules/netdevices.mk

@@ -666,7 +666,7 @@ $(eval $(call KernelPackage,igbvf))
 define KernelPackage/ixgbe
   SUBMENU:=$(NETWORK_DEVICES_MENU)
   TITLE:=Intel(R) 82598/82599 PCI-Express 10 Gigabit Ethernet support
-  DEPENDS:=@PCI_SUPPORT +kmod-mdio +kmod-ptp +kmod-hwmon-core
+  DEPENDS:=@PCI_SUPPORT +kmod-mdio +kmod-ptp +kmod-hwmon-core +LINUX_5_4:kmod-libphy
   KCONFIG:=CONFIG_IXGBE \
     CONFIG_IXGBE_VXLAN=n \
     CONFIG_IXGBE_HWMON=y \