kernel: add kmod-usb-net-lan78xx

Add kernel module for Microchip LAN78XX based USB 2 & USB 3
10/100/1000 Ethernet adapters. [1]

This kernel module is required for the Seeed Studio's Mini Router
based on RPI CM4 [2].

[1] <https://cateee.net/lkddb/web-lkddb/USB_LAN78XX.html>
[2] <https://www.seeedstudio.com/Dual-GbE-Carrier-Board-with-4GB-RAM-32GB-eMMC-RPi-CM4-Case-p-5029.html>

Link: <https://github.com/openwrt/openwrt/pull/4893

>
Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>
(added kmod-phy-microchip and kmod-fixed-phy dependencies,
rpi3 needs lan78xx but has it built-in)
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

package/kernel/linux/modules/usb.mk

@@ -1201,6 +1201,23 @@ endef
 $(eval $(call KernelPackage,usb-net-kaweth))
 
 
+define KernelPackage/usb-net-lan78xx
+  TITLE:=USB-To-Ethernet Microchip LAN78XX convertors
+  DEPENDS:=+kmod-fixed-phy +kmod-phy-microchip
+  KCONFIG:=CONFIG_USB_LAN78XX
+  FILES:=$(LINUX_DIR)/drivers/$(USBNET_DIR)/lan78xx.ko
+  AUTOLOAD:=$(call AutoProbe,lan78xx)
+  $(call AddDepends/usb-net)
+endef
+
+define KernelPackage/usb-net-lan78xx/description
+ Kernel module for Microchip LAN78XX based USB 2 & USB 3
+ 10/100/1000 Ethernet adapters.
+endef
+
+$(eval $(call KernelPackage,usb-net-lan78xx))
+
+
 define KernelPackage/usb-net-pegasus
   TITLE:=Kernel module for USB-to-Ethernet Pegasus convertors
   KCONFIG:=CONFIG_USB_PEGASUS