Revert "drm/msm/dp: use drm_bridge_hpd_notify() to report HPD status changes"

This reverts commit e467e0bde881 ("drm/msm/dp: use
drm_bridge_hpd_notify() to report HPD status changes").

The commit changed the way how the MSM DP driver communicates
HPD-related events to the userspace. The mentioned commit made some of
the HPD events being reported earlier. This way userspace starts poking
around. It interacts in a bad way with the dp_bridge_detect and the
driver's state machine, ending up either with the very long delays
during hotplug detection or even inability of the DP driver to report
the display as connected.

A proper fix will involve redesigning of the HPD handling in the MSM DP
driver. It is underway, but it will be intrusive and can not be thought
about as a simple fix for the issue. Thus, revert the offending commit.

Fixes: e467e0bde881 ("drm/msm/dp: use drm_bridge_hpd_notify() to report HPD status changes")
Link: https://gitlab.freedesktop.org/drm/msm/-/issues/50
Reported-by: Johan Hovold <[email protected]>
Link: https://lore.kernel.org/r/[email protected]/
Signed-off-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Abhinav Kumar <[email protected]>
Tested-by: Paloma Arellano <[email protected]>
Tested-by: Johan Hovold <[email protected]>
Tested-by: Neil Armstrong <[email protected]> # on SM8650-HDK
Patchwork: https://patchwork.freedesktop.org/patch/580313/
Link: https://lore.kernel.org/r/[email protected]

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