hana: Add EC console USART internal pull-up

This change prevents the floating RX console pin from entering unwanted
commands.

BRANCH=oak
BUG=b:67033247
TEST=manual
  load on hana and probe USART RX pin

Change-Id: I6dc05e03f82dcc71ea6f957f93c5fe7c6b65d2bf
Signed-off-by: Rong Chang <rongchang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/722381
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
1 file changed