rockchip: cosmetic: Move rock board to its correct position

Somehow 43b5c78d ("rockchip: cosmetic: Sort RK3288 boards") moved
the rock board in between some rk3288 board, probably as a result of
rebasing.

So move it back to its original position above all rk3288 boards.

Fixes: 43b5c78d ("rockchip: cosmetic: Sort RK3288 boards")
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Simon Glass <sjg@chromium.org>