ARM: dts: msm: Add VDD rail for SD card slot on mdmcalifornium

mdmcalifornium-nand-cdp & mdmcalifornium-nand-mtp boards have
SD card slot powered by fixed voltage GPIO controlled regulator.
Add this regulator information to make sure VDD rail is powered on
when required.

CRs-Fixed: 967536
Change-Id: Ie4ca8bf5f3a2ef7b7a4d374c6db15e7d746d1ff0
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>