mainboard/google/eve: Enable internal pull-down on USB_C{0,1}_DP_HPD

These lines act as inputs to both EC and AP and when the corresponding
TCPC mux is in low power mode the line is floating.  Add an internal
pull-down to each GPIO to prevent it from floating in this state.

BUG=b:35775012
BRANCH=none
TEST=Verify that the kernel does not see a device present on DP when
the TCPC mux is in low power mode.

Change-Id: Ie229f84871e9994467c0ab660cc7e271a51d9cbb
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/19263
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
1 file changed