kernel: rtl8261n: allow selection as package

Previously, devices would have to select `CONFIG_RTL8261N_PHY=Y` in the
whole target's kernel config. Now that this driver is becoming usable
for devices other than Realtek switches, allow packaging this driver
separately.

Signed-off-by: Kenneth Kasilag <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20429
Signed-off-by: Hauke Mehrtens <[email protected]>

package/kernel/linux/modules/netdevices.mk

@@ -525,6 +525,22 @@ endef
 $(eval $(call KernelPackage,phy-realtek))
 
 
+define KernelPackage/phy-rtl8261n
+   SUBMENU:=$(NETWORK_DEVICES_MENU)
+   TITLE:=Realtek RTL8261N NBASE-T PHY driver
+   KCONFIG:=CONFIG_RTL8261N_PHY
+   DEPENDS:=+kmod-libphy
+   FILES:=$(LINUX_DIR)/drivers/net/phy/rtl8261n/rtl8261n.ko
+   AUTOLOAD:=$(call AutoLoad,18,rtl8261n,1)
+endef
+
+define KernelPackage/phy-rtl8261n/description
+   Supports the Realtek 8261N NBASE-T PHY.
+endef
+
+$(eval $(call KernelPackage,phy-rtl8261n))
+
+
 define KernelPackage/phy-smsc
    SUBMENU:=$(NETWORK_DEVICES_MENU)
    TITLE:=SMSC PHY driver