ARM: ux500: Set eMMC and WLAN card slot as non-removable

For several reasons, the mmc protocol layer expects devices
being non-removable to use MMC_CAP_NONREMOVABLE, so then we
adapt to this expectation.

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