sunxi: call fdt_fixup_ethernet again to set macaddr for more aliases

sunxi: call fdt_fixup_ethernet again to set macaddr for more aliases

Sometimes some ethernet aliases do not exist in U-Boot DT but they
exist in the DT used to boot the system (for example, modified via DT
overlays). In this situation setup_environment is called again in
ft_board_setup() to generate macaddr environment variable for them.
However now the call to fdt_fixup_ethernet() is moved before the call
of ft_board_setup().

Call fdt_fixup_ethernet() again to add MAC addresses for the extra
ethernet aliases.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
[updated commit message]
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>