Update README to reflect that these configs are just temporary. The
idea is to get them upstream where they belong.

Signed-off-by: Matt Porter <matt@ohporter.com>
config file for A13 OLinuXino

This config is tested with a Flyswatter 2 on an A13 OLinuXino
MICRO board. It should work on the standard board as well and
most/all other sunxi boards.

Signed-off-by: Matt Porter <matt@ohporter.com>