configs: sunxi: Add support for Lichee Pi Nano

The Lichee Pi Nano is a board based on the F1C100s.
Add defconfigs for it.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>