Cave: Add override for JTAG to UART for USBPD

Enable access to USBPD on cave boards.

BUG=chrome-os-partner:50971
BRANCH=TOT
TEST=none

Change-Id: If34387bd7faf07e67713926975e77f78efdb9de6
Signed-off-by: Zhuo-hao Lee <zhuo-hao.lee@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/333825
Reviewed-by: Shawn N <shawnn@chromium.org>
1 file changed