linux-wandboard

drm: prune modes when output is disconnected.

When an output was disconnected, its mode list would remain.  If you later
plugged into a sink with no EDID (projector, etc), you'd inherit the mode
list from the old sink, which is not what you want.

taken from Fedora kernel

Signed-off-by: Dave Airlie <airlied@redhat.com>