drm/radeon: avoid bouncing connector status btw disconnected & unknown

drm/radeon: avoid bouncing connector status btw disconnected & unknown

Since force handling rework of 31f1a3b2ca388ca5d66f481b98ef0cbbcb871948
we could end up bouncing connector status btw disconnected and unknown.
When connector status change a call to output_poll_changed happen which
in turn ask again for detect but with force set.

So set the load detect flags whenever we report the connector as
connected or unknown this avoid bouncing btw disconnected and unknown.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>