N1 CoreELEC mac address fix

mac-address-loader@.service

[Unit]
Description=MAC address loader for %I From bootloader env
ConditionFileIsExecutable=/usr/sbin/fw_printenv
Wants=network-pre.target
Before=network-pre.target
BindsTo=sys-subsystem-net-devices-%i.device
After=sys-subsystem-net-devices-%i.device

[Service]
Type=oneshot
ExecStartPre=/bin/bash -c '[ -z $(/usr/sbin/fw_printenv mac_%i -n 2>/dev/null) ] && { echo "Error: No Mac Address detect for %i from bootloader env";exit 1; } || exit 0'
ExecStart=/bin/bash -c 'MAC_%i=$(/usr/sbin/fw_printenv mac_%i -n 2>/dev/null);/sbin/ip link set dev %i address $MAC_%i'
#ExecStart=/sbin/ip link set dev %i up

[Install]
WantedBy=multi-user.target

UsAge: https://blog.ihipop.info/?p=5315