drm_hwcomposer: Add connection state to DrmConnector

So we can determine if it's connected or not.

BUG=chrome-os-partner:41682
TEST=Tested on ryu with DP

Change-Id: Ie0dadb2737d3a98257fb6e4fa02f17d7dae44f6c
Signed-off-by: Sean Paul <seanpaul@chromium.org>
2 files changed