kunimitsu: Disable HS200 on the eMMC

Disable HS200 on the eMMC because it is not working on some SKUs
which have different eMMC.

BUG=chrome-os-partner:43534
BRANCH=none
TEST=Boot eMMC on Kunimitsu Fab3

Change-Id: I64c838ff57a13fd97c9304074b8abbb9c857a691
Signed-off-by: Wenkai Du <wenkai.du@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/293810
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
1 file changed