ARM: dts: Add sdio0 and sdio1 to the rk3288

This patch requires that <https://patchwork.kernel.org/patch/4701721/

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land in order to compile.

Reviewed-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Addy Ke <addy.ke@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>