rockchip: misc: Set eth1addr mac address

Set eth1addr in addition to ethaddr.

Also allow fdt fixup of ethernet mac addresses when CMD_NET is disabled.
Set ethaddr and eth1addr based on HASH and SHA256 options.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>