ARM: ux500: Add sdi devices to the VAPE PM domain

The mmci driver handle these devices properly from a runtime PM
perspective, including register context save/restore. Therefore let's
add them into VAPE PM domain for ux500.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>