linux: Force CONFIG_NET=y when using mdev+devtempfs for /dev management

Since mdev was switched to the daemon mode introduced in Busybox 1.31.0,
it requires CONFIG_NET to be enabled in the kernel such that the mdev
daemon can listen to netlink events.

Signed-off-by: Titouan Christophe <titouan.christophe@railnova.eu>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

linux/linux.mk

@@ -335,6 +335,8 @@ define LINUX_KCONFIG_FIXUP_CMDS
 		$(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
 	$(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
 		$(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config))
+	$(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV),
+		$(call KCONFIG_ENABLE_OPT,CONFIG_NET,$(@D)/.config))
 	$(if $(BR2_PACKAGE_AUDIT),
 		$(call KCONFIG_ENABLE_OPT,CONFIG_NET,$(@D)/.config)
 		$(call KCONFIG_ENABLE_OPT,CONFIG_AUDIT,$(@D)/.config))