ARM: dt: apq8074: prevent SD card detection loop

The Dragonboard HW design causes the card detection GPIO
looping between card present and card not present modes,
if the system boots without SD card. To fix this issue,
VDD supply should be always turned on.

Change-Id: I10d6e7fbcef9082da6e8fc051ebb369b1b1bfe68
Signed-off-by: Ilia Lin <ilialin@codeaurora.org>