Add the basic support for Sunplus SP7021-Demo-V3 board.
Signed-off-by: Qin Jian <qinjian@cqplus1.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>