kernel: kmod-dsa-notag: Add driver

The CONFIG_B53 kernel config option will select this driver. Add
the driver to the kernel config menu and make kmod-dsa-b53 depend on
it.

Link: https://github.com/openwrt/openwrt/pull/19480
Signed-off-by: Hauke Mehrtens <[email protected]>

package/kernel/linux/modules/netdevices.mk

@@ -604,10 +604,25 @@ endef
 $(eval $(call KernelPackage,dsa))
 
 
+define KernelPackage/dsa-notag
+  SUBMENU:=$(NETWORK_DEVICES_MENU)
+  TITLE:=DSA No-op tag driver
+  DEPENDS:=+kmod-dsa
+  KCONFIG:=CONFIG_NET_DSA_TAG_NONE
+  FILES:=$(LINUX_DIR)/net/dsa/tag_none.ko
+endef
+
+define KernelPackage/dsa-notag/description
+  Kernel module support for switches which don't tag frames over the CPU port.
+endef
+
+$(eval $(call KernelPackage,dsa-notag))
+
+
 define KernelPackage/dsa-b53
   SUBMENU:=$(NETWORK_DEVICES_MENU)
   TITLE:=Broadcom BCM53xx managed switch DSA support
-  DEPENDS:=+kmod-dsa
+  DEPENDS:=+kmod-dsa +kmod-dsa-notag
   KCONFIG:=CONFIG_B53 \
   CONFIG_NET_DSA_TAG_BRCM \
   CONFIG_NET_DSA_TAG_BRCM_LEGACY \