wtm2: disable SDcard USB port

This is causing hangs in depthcharge (again?) so for now
turn that port off so the resulting coreboot images are
at least useful.

BUG=none
BRANCH=none
TEST=boot on wtm2 and press Ctrl+D at developer screen with USB keyboard

Change-Id: I32c7774a95b0020b97105e0fa42c21ccb617c718
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/65615
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
1 file changed