systemd-conf: drop no longer needed bbappend for systemd-conf

This change has been upstreamed and backported. With our latest sync to
the dunfell branch we no longer need this.

Signed-off-by: Stefan Schmidt <stefan.schmidt@huawei.com>

meta-ohos-core/recipes-core/systemd-conf/files/wired.network

-[Match]
-Name=en* eth*
-KernelCommandLine=!nfsroot
-KernelCommandLine=!ip
-
-[Network]
-DHCP=yes
-
-[DHCP]
-RouteMetric=10
-ClientIdentifier=mac

meta-ohos-core/recipes-core/systemd-conf/systemd-conf_%.bbappend

-# SPDX-FileCopyrightText: Huawei Inc.
-#
-# SPDX-License-Identifier: Apache-2.0
-
-FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
-
-do_install_append_qemuall() {
-        install -D -m0644 ${WORKDIR}/wired.network ${D}${systemd_unitdir}/network/80-wired.network
-}