ARM: dts: msm: Add 1.8V for UHS SD card to msm8937-qrd

Update the voltage range (min voltage range to 1.8V).
UHS SD card work normally at 1.8v. Without this fix, UHS SD card
will work as common HS SD card.

CRs-Fixed: 951606
Change-Id: If027c61a02955692f3f4317ddd30d56790887c1d
Signed-off-by: xiaonian <xiaonian@codeaurora.org>