ARM: dts: msm: fix sd card regulator info for msm krypton

The SD card's VDD regulator is controlled by gpio 89 and not gpio 51
as in the initial bring up hardware. Fix the regulator information so
that the SD card gets detected and is usuable.

Change-Id: I3df15541542be6e109d7302fe331cab282c8a463
Signed-off-by: Krishna Konda <kkonda@codeaurora.org>