UPSTREAM: drm/edid: respect connector force for drm_get_edid ddc probe

UPSTREAM: drm/edid: respect connector force for drm_get_edid ddc probe

Skip DDC probe for forced connector status. Don't try to read the EDID
if the connector is forced off. Skipping probe for forced on connectors
will make more sense when drm_do_get_edid() will handle override and
firmware EDIDs.

Change-Id: I43c16b3bfd85520536445265ee693765538e4800
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1487344854-18777-4-git-send-email-jani.nikula@intel.com
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
(cherry picked from commit 15f080f08d48af9388142e45a247c8410736178b)