ARM: dts: msm: decrease SD card VDD current of LPM mode for SKUH

due to VDD need always on to support SD card hotplug, it will
cause power compsuption in LPM mode, so decrease VDD current
to 4mA for saving power in LPM mode.

Change-Id: Ie7e832334a21cb49e1ee4520425d8df82c6555a4
Signed-off-by: Guoping Yu <guopingy@codeaurora.org>