kernel: Add kmod-phy-realtek

The r8169 driver uses the phy lib with the realtek phy driver in kernel
4.19 instead of integrating the phy driver into the mac driver.
Add the new phy driver and add this missing dependency.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/kernel/linux/modules/netdevices.mk

@@ -180,6 +180,22 @@ endef
 $(eval $(call KernelPackage,phy-broadcom))
 
 
+define KernelPackage/phy-realtek
+   SUBMENU:=$(NETWORK_DEVICES_MENU)
+   TITLE:=Realtek Ethernet PHY driver
+   KCONFIG:=CONFIG_REALTEK_PHY
+   DEPENDS:=+kmod-libphy
+   FILES:=$(LINUX_DIR)/drivers/net/phy/realtek.ko
+   AUTOLOAD:=$(call AutoLoad,18,realtek,1)
+endef
+
+define KernelPackage/phy-realtek/description
+   Supports the Realtek 821x PHY.
+endef
+
+$(eval $(call KernelPackage,phy-realtek))
+
+
 define KernelPackage/swconfig
   SUBMENU:=$(NETWORK_DEVICES_MENU)
   TITLE:=switch configuration API
@@ -466,7 +482,7 @@ $(eval $(call KernelPackage,8139cp))
 define KernelPackage/r8169
   SUBMENU:=$(NETWORK_DEVICES_MENU)
   TITLE:=RealTek RTL-8169 PCI Gigabit Ethernet Adapter kernel support
-  DEPENDS:=@PCI_SUPPORT +kmod-mii +r8169-firmware
+  DEPENDS:=@PCI_SUPPORT +kmod-mii +r8169-firmware +LINUX_4_19:kmod-phy-realtek
   KCONFIG:=CONFIG_R8169 \
     CONFIG_R8169_NAPI=y \
     CONFIG_R8169_VLAN=n