drm/bridge: adv7511: Switch to using drm_kms_helper_hotplug_event()

In chasing down a previous issue with EDID probing from calling
drm_helper_hpd_irq_event() from irq context, Laurent noticed
that the DRM documentation suggests that
drm_kms_helper_hotplug_event() should be used instead.

Thus this patch replaces drm_helper_hpd_irq_event() with
drm_kms_helper_hotplug_event(), which requires we update the
connector.status entry and only call _hotplug_event() when the
status changes.

Cc: David Airlie <[email protected]>
Cc: Archit Taneja <[email protected]>
Cc: Wolfram Sang <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: [email protected]
Reviewed-by: Laurent Pinchart <[email protected]>
Tested-by: Laurent Pinchart <[email protected]>
Signed-off-by: John Stultz <[email protected]>
Signed-off-by: Archit Taneja <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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