drm/i915: Revert hdmi HDP pin checks

This reverts

commit 8ec22b21
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Fri May 11 18:01:34 2012 +0100

    drm/i915/hdmi: Query the live connector status bit for G4x

and

commit b0ea7d37


Author: Damien Lespiau <damien.lespiau@intel.com>
Date:   Thu Dec 13 16:09:00 2012 +0000

    drm/i915/hdmi: Read the HPD status before trying to read the EDID

They reliably cause HDMI to not be detected on some systems (like my
ivb or the bug reporters gm45). To fix up the very slow unplug issues
we might want to fire up a 2nd detect cycle a few hundred ms after
each hotplug. But for now at least make displays work again.

I somewhat suspect that this is confined to HDMI connectors, since all
the machines I have with DP+ outputs work correctly.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=52361
Cc: Damien Lespiau <damien.lespiau@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@vger.kernel.org.kernel.org # for 8ec22b21


Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>