krane: Fix DP AUX mux polarity is reversed.
krane: Fix DP AUX mux polarity is reversed.

Krane's rev3 DP AUX mux polarity is reversed, and this is a
workaround to fix the issue.

TEST=make BOARD=krane
BUG=b:131130013
BRANCH=None

Change-Id: Ie6f3a84fac6bc09d6d588b0e413a9efc29b039fc
Signed-off-by: Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1593194
Commit-Ready: Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@chromium.org>
Tested-by: Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@chromium.org>
Reviewed-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec