Here we add the device node for the SDI4 (MMC) port to the u9540
Device Tree source file. This will allow successful probing of
the internal MMC storage device when booting with DT enabled.
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>