Lars: Enable eMMC HS400 mode

With CL317451 and CL317267, Kingston eMMC can run under HS400 mode.

BUG=chrome-os-partner:48017
BRANCH=none
TEST=run consecutive boot 100 times on Lars proto Kingston SKU, and
MMC errors didn't happen.

Change-Id: I9e47b6ba64ac94acff7673fca86fa62bfb30edd9
Signed-off-by: David Wu <David_Wu@quantatw.com>
Reviewed-on: https://chromium-review.googlesource.com/320194
Commit-Ready: David Wu <david_wu@quantatw.com>
Tested-by: David Wu <david_wu@quantatw.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
1 file changed