Snappy: clear hpd bit in board level tcpc init
Snappy: clear hpd bit in board level tcpc init

PD alternate mode is covered in tcpc interface. So tcpci_tcpm_init()
doesn't reset HPD. If keeping HDMI/DP type-C cable connected, doing
sysjump sets HPD signal to high while it's already high(this high comes
from previous state), then OS doesn't output to HDMI/DP monitor.

BUG=None
BRANCH=none
TEST=make buildall

Change-Id: I9b23cee82716d9073c98b6b53a0e54d587baf0ea
Signed-off-by: Bruce.Wan <a898a81068da7266439365c3bd380deb6a0a895f@quantatw.com>
Reviewed-on: https://chromium-review.googlesource.com/409732
Commit-Ready: Devin Lu <052fe648504800b810f29702ef4f3db83fad68bf@quantatw.com>
Tested-by: Devin Lu <052fe648504800b810f29702ef4f3db83fad68bf@quantatw.com>
Reviewed-by: Aaron Durbin <af0622ab041e8b0f8e5819838dcc93898196e71f@chromium.org>

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