drm/i915: Move long hpd handling into the hotplug work

We can't rely on connector->status in the detect() hook if the long hpd
was already handled by the dig_port_work as that won't update
connector->status. Thus we have to defer the long hpd handling entirely
until the hotplug work runs to avoid the double long hpd handling
the "detect_done" flag is trying to prevent.

We'll start to depend on connector->status being up to date in a
following patch.

Cc: Damien Cassou <[email protected]>
Cc: [email protected]
Cc: Arno <[email protected]>
Cc: Shubhangi Shrivastava <[email protected]>
Cc: Sivakumar Thulasimani <[email protected]>
Cc: Ander Conselvan de Oliveira <[email protected]>
Cc: [email protected]
Tested-by: Arno <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=83348
Signed-off-by: Ville Syrjälä <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Ander Conselvan de Oliveira <[email protected]>
(cherry picked from commit 27d4efc5591a5853de54713bc717de73c8951e17)
Signed-off-by: Jani Nikula <[email protected]>

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