DRM: adv7511: Properly initialize dpms_mode and status

Set dpms_mode to DRM_MODE_DPMS_OFF and status to connector_status_disconnected
to make sure that they match the state of the chip. This fixes an issue where
the monitor was incorrectly reported as disconnected during cold boot.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
DRM: adv7511: Avoid uneccessary disconnected events

Only insert a delayed disconnected event when we transition from connected to
connect. If we transition from disconnected to connected there is no need for
this since the system will already assume that the monitor was disconnected.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>