buildroot

board: Add Orangepi Win/Win Plus support

Add initial support for Orangepi Win/Win Plus
board with below features:
- U-Boot 2017.11
- Linux 4.14
- Default packages from buildroot

Cc: zhaoyifan <zhao_steven@263.net>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>