SD0 may operate in low-voltage mode, with a minimum of 0.41V
and a maximum of 1.5V.  This is indicated by bit 4 of FUSE7.
Signed-off-by: NAndrew Bresticker <abrestic@chromium.org>
Signed-off-by: NVince Hsu <vinceh@nvidia.com>
broonie.e6264@m.evernote.com
Signed-off-by: NMark Brown <broonie@linaro.org>