The reverted patch causes linking error with disabled CONFIG_NET:
cmd/built-in.o: In function `eth_env_get_enetaddr':
u-boot-v2019.10/cmd/nvedit.c:363: undefined reference to `eth_parse_enetaddr'
Function setup_environment() in board/sunxi/board.c calls
eth_env_set_enetaddr() to setup stable mac address for ethernet interfaces.
This needs to be implemented and succeed even if net is disabled in u-boot,
as it ensures Linux will not generate random MAC addresses, and picks the
ones provided by u-boot via DT. See fdt_fixup_ethernet().
This feature is independent of the whole network stack and network drivers
in u-boot.
This revert fixes the linking error.
Signed-off-by: Ondrej Jirman <megous@megous.com>